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STM32 pin assignments
PA0 X4
PA1 X3
PA2 RS422 pin 4
PA3 RS422 pin 1
PA4
PA5
PA6 RS422 pin 3
PA7 Via 472 to Run switch
PA8 Y1
PA9 RS232
PA10 RS232
PA11 Y2
PA12 Y3
PA13 SWDIO
PA14 SWCLK
PA15
PB0 10k to ground
PB1 AD1 via condiitoning (conditioning removed (apart from zener) and with 10k pull up)
PB2 AD0 via conditioning
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PB10
PB11
PB12
PB13
PB14
PB15 X2
PC0
PC1
PC2 Err LED
PC3 Run LED
PC4 X5
PC5
PC6 X1
PC7 X0
PC8 24V detect
PC9 Y0
PC10
PC11
PC12
PC13 tamper RTC
PC14 OSC32 (no sign of xtal)
PC15 OSC32 (no sign of xtal)
PD0 Y4
PD1 Y5
PD2 Y6
PD3 Y7
PD4
PD5
PD6
PD7
PD8
PD9
PD10 X13
PD11 X12
PD12 X11
PD13 X10
PD14 X7
PD15 X6
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
PE8
PE9
PE10
PE11
PE12
PE13
PE14
PE15
VBAT
BOOT0 strapped by R16/R72
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