ST72321BXXX-AUTO datasheet(2/247 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]

Direct Link	http://www.st.com

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2 / 247 page

Contents

ST72321Bxxx-Auto

2/247

Contents

1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

1.1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

1.2

Differences between ST72321B-Auto and ST72321B datasheets . . . . . . 20

1.2.1

Principal differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

1.2.2

Minor content differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

1.2.3

Editing and formatting differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2

Package pinout and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.1

Package pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.2

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3

Register and memory map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4

Flash program memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4.2

Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4.3

Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4.3.1

Readout protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

4.4

ICC interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

4.5

ICP (in-circuit programming) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

4.6

IAP (in-application programming) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

4.7

Related documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

4.8

Flash control/status register (FCSR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5

Central processing unit (CPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.2

Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.3

CPU registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.3.1

Accumulator (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.3.2

Index registers (X and Y) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.3.3

Program counter (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.3.4

Condition code (CC) register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.3.5

Stack pointer (SP) register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

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