ST72321BXXX-AUTO datasheet(4/247 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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4 / 247 page

Contents

ST72321Bxxx-Auto

4/247

8.4.1

Active Halt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

8.4.2

Halt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

9

I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

9.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

9.2

Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

9.2.1

Input modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

9.2.2

Output modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

9.2.3

Alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

9.3

I/O port implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

9.4

Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

9.5

Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

10

Watchdog timer (WDG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

10.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

10.2

Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

10.3

Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

10.4

How to program the watchdog timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

10.5

Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

10.6

Hardware watchdog option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

10.7

Using Halt mode with the WDG (WDGHALT option) . . . . . . . . . . . . . . . . 85

10.8

Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

10.9

Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

10.9.1

Control register (WDGCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

11

Main clock controller with real-time clock and beeper (MCC/RTC) . . 87

11.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11.2

Programmable CPU clock prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11.3

Clock-out capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11.4

Real-time clock timer (RTC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11.5

Beeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11.6

Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

11.7

Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

11.8

Main clock controller registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

11.8.1

MCC control/status register (MCCSR) . . . . . . . . . . . . . . . . . . . . . . . . . . 89

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