diff --git a/CHANGELOG.md b/CHANGELOG.md
index aac033b..6bf8098 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,21 +6,24 @@
 
 - [Integration](https://crates.io/crates/mcan-core) with the [`mcan`](https://crates.io/crates/mcan) crate.
 - Implementation of blocking::i2c::Transactional trait from [embedded-hal](https://crates.io/crates/embedded-hal) for TWI device.
+- Support for `critical-section` feature, falling down to PAC optional dependency.
 
 ### Changed
-- Remove `rust-toolchain.toml` and control MSRV from .github/workflow/ files instead.
+- Remove `rust-toolchain.toml` and control MSRV from `.github/workflow/` files instead.
 - Update `cortex-m-rt` version in examples to `0.7.3`.
 - Switched from AFE0_AD6 to  AFE0_AD8 for the atsamv71_xult board ADC example code.
+- The `rt` separated to don't act as part of chip selection feature anymore.
 
 ### Removed
 - Huge generated source code for PACs removed, new location for them [`atsamx7x-pac`](/atsams-rs/atsamx7x-pac) (user side generated)
 
 ### Fixed
-- Examples now build and link again
-- Examples now build again again
+- Examples now build and link again.
+- Examples now build again again.
 - [#62] Remove ambiguous reexports from `src/serial/mod.rs`.
 - TWIHS: Fix issue with clock frequency calculation.
-- Fix CI: source of PACs matrix + clippy satisfaction
+- Fix CI: source of PACs matrix + clippy satisfaction.
+- Fixes doctest use of `take()` which now require `critical-section`.
 
 ## [v0.4.2] 2022-11-06
 
diff --git a/hal/src/clocks/mod.rs b/hal/src/clocks/mod.rs
index 23d9cdd..3f8f2ee 100644
--- a/hal/src/clocks/mod.rs
+++ b/hal/src/clocks/mod.rs
@@ -28,7 +28,7 @@ For example, if we want to configure the [`MainClock`]:
 use atsamx7x_hal as hal;
 use hal::fugit::RateExtU32;
 
-let pac = unsafe{hal::pac::Peripherals::steal()};
+let pac = hal::pac::Peripherals::take().unwrap();
 let clocks = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into());
 let mainck = clocks
     .mainck
@@ -72,7 +72,7 @@ use hal::efc::{Efc, VddioLevel};
 use hal::fugit::RateExtU32;
 
 // configure the clock hierarchy
-let pac = unsafe{hal::pac::Peripherals::steal()};
+let pac = hal::pac::Peripherals::take().unwrap();
 let clocks = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into());
 let slck = clocks.slck.configure_external_normal();
 let mainck = clocks
diff --git a/hal/src/pio/bank.rs b/hal/src/pio/bank.rs
index 42fce89..27cb34d 100644
--- a/hal/src/pio/bank.rs
+++ b/hal/src/pio/bank.rs
@@ -42,7 +42,7 @@ impl<B: PinBank> BankInterrupts<B> {
     /// # use hal::pio::*;
     /// # use hal::clocks::*;
     /// # use hal::efc::*;
-    /// # let pac = unsafe{hal::pac::Peripherals::steal()};
+    /// # let pac = hal::pac::Peripherals::take().unwrap();
     /// # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
     /// let mut banka = BankA::new(pac.PIOA, &mut mck, &slck, BankConfiguration::default());
     /// for pin in banka.interrupts.iter() {
diff --git a/hal/src/pio/mod.rs b/hal/src/pio/mod.rs
index 43c832d..d50b5ea 100644
--- a/hal/src/pio/mod.rs
+++ b/hal/src/pio/mod.rs
@@ -86,7 +86,7 @@ The below example configures [`Pin<PA11, Input>`] to trigger on
 # use hal::pio::*;
 # use hal::clocks::*;
 # use hal::efc::*;
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
 
 let banka = BankA::new(
diff --git a/hal/src/rtt.rs b/hal/src/rtt.rs
index 906d4be..d738ca5 100644
--- a/hal/src/rtt.rs
+++ b/hal/src/rtt.rs
@@ -23,7 +23,7 @@ via [`Rtt::new_8192Hz`].
 # use hal::rtt::*;
 # use hal::fugit::RateExtU32;
 # use rtic_monotonic::*;
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
 
 let mono: Mono<100> = Rtt::new(pac.RTT, &slck, 100.Hz()).unwrap().into_monotonic();
@@ -37,7 +37,7 @@ or
 # use hal::rtt::*;
 # use hal::fugit::RateExtU32;
 # use rtic_monotonic::Monotonic;
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
 
 use hal::ehal::{blocking::delay::DelayMs, timer::{CountDown, Cancel}};
@@ -83,7 +83,7 @@ pub enum RttError {
     /// # use hal::efc::*;
     /// # use hal::rtt::*;
     /// # use hal::fugit::RateExtU32;
-    /// # let pac = unsafe{hal::pac::Peripherals::steal()};
+    /// # let pac = hal::pac::Peripherals::take().unwrap();
     /// # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
     /// let rtt: Rtt<100> = Rtt::new(pac.RTT, &slck, 100.Hz()).unwrap();
     /// ```
diff --git a/hal/src/serial/spi.rs b/hal/src/serial/spi.rs
index a2584de..cde2c68 100644
--- a/hal/src/serial/spi.rs
+++ b/hal/src/serial/spi.rs
@@ -23,7 +23,7 @@ Interrupt event management is handled by the [`event system`](crate::generics::e
 # use hal::serial::spi::*;
 # use hal::serial::ExtBpsU32;
 # use hal::fugit::ExtU32;
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
 
 let bankd = BankD::new(pac.PIOD, &mut mck, &slck, BankConfiguration::default());
diff --git a/hal/src/serial/twi.rs b/hal/src/serial/twi.rs
index c8154ec..4c54828 100644
--- a/hal/src/serial/twi.rs
+++ b/hal/src/serial/twi.rs
@@ -20,7 +20,7 @@ implemented.
 # use hal::efc::*;
 # use hal::serial::twi::*;
 # use hal::fugit::RateExtU32;
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
 let banka = BankA::new(pac.PIOA, &mut mck, &slck, BankConfiguration::default());
 
diff --git a/hal/src/serial/uart.rs b/hal/src/serial/uart.rs
index 67669a9..7503092 100644
--- a/hal/src/serial/uart.rs
+++ b/hal/src/serial/uart.rs
@@ -26,7 +26,7 @@ Interrupt event management is handled by the [`event system`](crate::generics::e
 # use hal::serial::uart::*;
 # use hal::serial::ExtBpsU32;
 # use hal::fugit::{ExtU32, RateExtU32};
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 let clocks = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into());
 let slck = clocks.slck.configure_external_normal();
 let mainck = clocks
diff --git a/hal/src/serial/usart/mod.rs b/hal/src/serial/usart/mod.rs
index 70e1240..0215814 100644
--- a/hal/src/serial/usart/mod.rs
+++ b/hal/src/serial/usart/mod.rs
@@ -32,7 +32,7 @@ Mode support depends on what [`Pin`]s that are available for the
 # use hal::serial::usart::*;
 # use hal::serial::ExtBpsU32;
 # use hal::fugit::{ExtU32, RateExtU32};
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
 use hal::generics::events::EventHandler;
 use hal::ehal::serial::{Read, Write};
diff --git a/hal/src/tc/mod.rs b/hal/src/tc/mod.rs
index aa667e7..57f1d3b 100644
--- a/hal/src/tc/mod.rs
+++ b/hal/src/tc/mod.rs
@@ -22,7 +22,7 @@ Refer to §50 for a full description on the capabilities offered by a [`Tc`].
 # use hal::efc::*;
 # use hal::tc::*;
 # use hal::fugit::ExtU32;
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
 let banka = hal::pio::BankA::new(
     pac.PIOA,
@@ -54,7 +54,7 @@ counter.sample_freq(100.millis());
 # use hal::clocks::*;
 # use hal::efc::*;
 # use hal::tc::*;
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
 let tc = Tc::new_tc0(pac.TC0, &mut mck);
 let driver = tc
@@ -80,7 +80,7 @@ let mono: Monotonic<Tc0, Ch1, Channel<Tc0, Ch0, Generate<HostClock, 12_000_000>>
 # use hal::clocks::*;
 # use hal::efc::*;
 # use hal::tc::*;
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
 let tc = Tc::new_tc0(pac.TC0, &mut mck);
 let driver = tc
@@ -410,7 +410,7 @@ pub enum TcError {
     /// # use hal::clocks::*;
     /// # use hal::efc::*;
     /// # use hal::tc::*;
-    /// # let pac = unsafe{hal::pac::Peripherals::steal()};
+    /// # let pac = hal::pac::Peripherals::take().unwrap();
     /// # let (slck, mut mck) = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into()).por_state(&mut Efc::new(pac.EFC, VddioLevel::V3));
     /// let tc = Tc::new_tc0(pac.TC0, &mut mck);
     /// let ch = tc.channel_0.generate::<15_000_000>(&mck).unwrap();
diff --git a/hal/src/usb.rs b/hal/src/usb.rs
index 5e8d4fb..0922381 100644
--- a/hal/src/usb.rs
+++ b/hal/src/usb.rs
@@ -16,7 +16,7 @@ extensively tested, and should be considered unstable at the moment.
 # use hal::efc::*;
 # use hal::usb::*;
 # use hal::fugit::RateExtU32;
-# let pac = unsafe{hal::pac::Peripherals::steal()};
+# let pac = hal::pac::Peripherals::take().unwrap();
 # let clocks = Tokens::new((pac.PMC, pac.SUPC, pac.UTMI), &pac.WDT.into());
 # let slck = clocks.slck.configure_external_normal();
 # let mainck = clocks