ST72321BXXX-AUTO datasheet(7/247 Pages) STMICROELECTRONICS

Part #	ST72321BXXX-AUTO

Description	8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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7 / 247 page

ST72321Bxxx-Auto

Contents

7/247

14.7

Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

14.8

SPI registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

14.8.1

Control register (SPICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

14.8.2

Control/status register (SPICSR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

14.8.3

Data I/O register (SPIDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

15

Serial communications interface (SCI) . . . . . . . . . . . . . . . . . . . . . . . . 140

15.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

15.2

Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

15.3

General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

15.4

Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

15.4.1

Serial data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

15.4.2

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

15.4.3

Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

15.5

Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

15.6

Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

15.7

SCI registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

15.7.1

Status register (SCISR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

15.7.2

Control register 1 (SCICR1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

15.7.3

Control register 2 (SCICR2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

15.7.4

Data register (SCIDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

15.7.5

Baud rate register (SCIBRR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

15.7.6

Extended receive prescaler division register (SCIERPR) . . . . . . . . . . 157

15.7.7

Extended transmit prescaler division register (SCIETPR) . . . . . . . . . . 158

16

I2C bus interface (I2C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

16.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

16.2

Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

16.2.1

I2C master features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

16.2.2

I2C slave features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

16.3

General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

16.3.1

Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

16.3.2

Communication flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

16.3.3

SDA/SCL line control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

16.4

Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

16.4.1

Slave mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

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