STM32W108CB datasheet(54/179 Pages) STMICROELECTRONICS

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General-purpose input/outputs

STM32W108CB, STM32W108HB

54/179

Doc ID 16252 Rev 2

6.5

General-purpose input / output (GPIO) registers

6.5.1

Port x configuration register (Low) (GPIO_PxCFGL)

Address offset: 0xB000 (GPIO_PACFGL), 0xB400 (GPIO_PBCFGL) and 0xB800

(GPIO_PCCFGL)

Reset value:

0x0000 4444

PC6

OSC32B

nTX_ACTIVE

Standard

PC7

OSC32A

OSC32_EXT

Standard

Default signal assignment (not remapped).

Overrides during reset as an input with pull up.

Overrides after reset as an open-drain output.

Alternate signal assignment (remapped).

Overrides in JTAG mode as an input with pull up.

Overrides in JTAG mode as a push-pull output.

Overrides in Serial Wire mode as either a push-pull output, or a floating input, controlled by the debugger.

Table 8.

GPIO signal assignments (continued)

GPIO

Analog

Alternate function

Input

Output current

drive

Px3_CFG

Px2_CFG

Px1_CFG

Px0_CFG

[15:12] Px3_CFG: GPIO configuration control.

0x0: Analog, input or output (GPIO_PxIN always reads 1).

0x1: Output, push-pull (GPIO_PxOUT controls the output).

0x4: Input, floating.

0x5: Output, open-drain (GPIO_PxOUT controls the output).

0x8: Input, pulled up or down (selected by GPIO_PxOUT: 0 = pull-down, 1 = pull-up).

0x9: Alternate output, push-pull (peripheral controls the output).

0xB: Alternate output SPI SCLK, push-pull (only for SPI master mode SCLK).

0xD: Alternate output, open-drain (peripheral controls the output).

[11:8] Px2_CFG: GPIO configuration control: see Px3_CFG above.

[7:4] Px1_CFG: GPIO configuration control: see Px3_CFG above.

[3:0] Px0_CFG: GPIO configuration control: see Px3_CFG above.

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