4

General-purpose input/outputs

The General-purpose input/output IP presented in the revision 13 of the STM32W108xx datasheet is split into three main parts:

●

Standard General-purpose input/output : GPIO

●

External interrupt: EXTI

●

Debug management: DBG

The GPIO_PAWAKE, GPIO_PBWAKE, GPIO_PCWAKE and GPIO_WAKEFILT registers are renamed respectively

PWR_WAKEPAR, PWR_WAKEPBR, PWR_WAKEPCR and PWR_WAKEFILTR registers. These registers are required to manage

the GPIO wake up resources from low power modes and will be presented in the low power mode section.

4.1

Standard General-purpose input/output

This part will contain only the GPIO configurations and status registers.

4.1.1

STM32W108xx GPIO Overview

Table 11 gives the list of the changes (renaming) made in the GPIO bits and registers.

Table 11.

GPIO bits and registers overview

Offset

(GPIOA/

GPIOB/

GPIOC)

Register

STM32W108xx GPIO bits/registers naming overview

0x00

GPIO_PxCFGL

Res

Px3_CFG

Px2_CFG

Px1_CFG

Px0_CFG

GPIOx_CRL

Res

CNFMODE3[3:0]

CNFMODE2[3:0]

CNFMODE1[3:0]

CNFMODE0[3:0]

0x04

GPIO_PxCFGH

Res

Px7_CFG

Px6_CFG

Px5_CFG

Px4_CFG

GPIOx_CRH

Res

CNFMODE7[3:0]

CNFMODE6[3:0]

CNFMODE5[3:0]

CNFMODE4[3:0]

0x08

GPIO_PxIN

Reserved

Px7

Px6

Px5

Px4

Px3

Px2

Px1

Px0

GPIOx_IDR

Reserved

IDR7

IDR6

IDR5

IDR4

IDR3

IDR2

IDR1

IDR0