Keychron C1 White Ver.1.2/20200720
HFD48KC900
This seem to be a rebranded SN32F268
| Pin | Function |
|---|---|
| P0.0 - P0.15 | C1 - C16 |
| P1.0 - P1.2 | Unused |
| P1.3 | Caps LED |
| P1.4 | Mac LED |
| P1.5 | Windows LED |
| P2.0 - P2.2 | A1 - A3 |
| P2.3 - P2.8 | D1 - D6 |
| P2.9 - P2.10 | A8 - A9 |
| P3.0 | C17 |
| P3.1 - P3.3 | Unused |
| P3.4 | A4 |
| P3.5 | BOOT |
| P3.6 | SWCLK |
| P3.7 | SWDIO / Windows-Mac switch |
The Caps, Mac and Windows LEDs are on when GPIO is driven high.
The Windows-Mac switch requires the interal pull-up, and is connected to ground in the Mac position.
SWD debugging should be possible if the switch is in the Windows position.
Partial switch & LED matrix schematic