AN2645 datasheet(23/36 Pages) STMICROELECTRONICS

Part #	AN2645

Description	Migration and compatibility guidelines for STM8S microcontroller applications

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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AN2645

Block-by-block compatibility analysis

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3.2

Digital I/O

This section describes the different aspects of compatibility related to digital I/Os:

●

GPIO ports

●

High-sink capability

●

External interrupts

More information related to digital I/O can be found in section 3.3: Timers.

3.2.1

GPIO

The basic GPIO structure consists of nine ports named from PA to PI with a maximum

number of 68 GPIO pins in the 80-pin package (refer to Table 18). When migrating to

packages with lower pin-count, the number of GPIO pins is reduced in consequence.

STM8S103K and STM8S903K have three additional GPIO pins compared to other sub-

families with the same 32-pin package. This is because they have I/Os instead of VDDIO,

VDDA and VSSA.

Table 18.

Total number of GPIOs in each package

I/O

port

Package size

LQFP80

(xxxM)

LQFP64

(xxxR)

LQFP48

(xxxC)

LQFP44

(xxxS)

LQFP32

(xxxK)(1)

Except STM8S103x and STM8S903x sub-families

LQFP32

(STM8S103

STM8S903)

LQFP20

(xxxF)

6652

8886

7767

8888

8751

822

Total

523834

AN2645 Datasheet(PDF) 23 Page - STMicroelectronics

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