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AN2645 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN2645
Description  Migration and compatibility guidelines for STM8S microcontroller applications
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2645 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN2645
2/36
Contents
1
STM8S family compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1
Family concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2
Fully compatible blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3
Blocks that are compatible with minor exceptions . . . . . . . . . . . . . . . . . . . 7
1.4
Blocks that are compatible with significant exceptions . . . . . . . . . . . . . . . . 8
2
Planning for migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
Block-by-block compatibility analysis . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1
Package pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.1
Migration from one sub-family to another one . . . . . . . . . . . . . . . . . . . . 13
3.1.2
Migration to a package with different pin-count within the same sub-family
15
3.1.3
System pins and package pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1.4
Digital power supply and package pinout . . . . . . . . . . . . . . . . . . . . . . . 20
3.1.5
ADC power supply and voltage reference in package pinout . . . . . . . . 20
3.1.6
Alternate functions and package pinout . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.2
Digital I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2.1
GPIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2.2
High-sink capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.2.3
External interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.3
Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.4
Analog-to-digital converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.4.1
ADC inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.4.2
ADC supply and reference pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.4.3
ADC modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.5
Communication peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.5.1
SPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.5.2
I2C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.5.3
CAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.5.4
UART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.6
Clock controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.6.1
HSE clock frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.6.2
HSI clock frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30


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