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ST72C254G2 数据表(PDF) 2 Page - STMicroelectronics

部件名 ST72C254G2
功能描述  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, I2C INTERFACES
PDF  135 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST72C254G2 数据表(HTML) 2 Page - STMicroelectronics

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Table of Contents
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1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . ... .. .. ... .. . ... .. . . ... .. . 6
2 PIN DESCRIPTION . . . . . . . . . . . . .... . ... .. . . .. .... .... .. . . . . . . . . . . . . . ... .. . .... . 7
3 REGISTER & MEMORY MAP . . . .... .. . . . . . . . . .... . ... .. .. .. . .... ... . . . . . . . . . . . . 10
4 FLASH PROGRAM MEMORY . . . . . . . . . . . . . . . . . .... . . . ... . . . . . . . . . . . . . ... .. . . .. . 13
4.1
INTRODUCTION . .... .. . .... . ... .. .. ... ... . . . . . . . . ... .. . . ... . ... . . . . ... 13
4.2
MAIN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... .... .. . . . . . . . . . . 13
4.3
STRUCTURAL ORGANISATION . . . . . . . . . . . . . . . .... . . . . ... . ... .. . . ... .. . . . 13
4.4
IN-SITU PROGRAMMING (ISP) MODE . . . . .... .... .. . .... .. . . . . . . ... .. . . . . . 13
4.5
MEMORY READ-OUT PROTECTION . . . . . .... .... .. . . . . . . . . . . . . . ... .. . .... 13
5 CENTRAL PROCESSING UNIT . . .... . ... .. . . . . .... .... .. . .... .. . . . . . . ... .. . . . . . 14
5.1
INTRODUCTION . .... .. . .... . ... .. .. ... ... . . . . . . . . ... .. . . ... . ... . . . . ... 14
5.2
MAIN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... .... .. . . . . . . . . . . 14
5.3
CPU REGISTERS . . . . . . . . . . . . . . . . . . . . . .... . . . ... . . . . . . . . . . . . . ... ... . . . . 14
6 SUPPLY, RESET AND CLOCK MANAGEMENT . . . . .... ... . . . . . . . . . . . . . . . . . . . . ... .. 17
6.1
LOW VOLTAGE DETECTOR (LVD) . . . . . . . . .... ... . . . . . . . . . . . . . . . . . . . . ... .. 18
6.2
RESET SEQUENCE MANAGER (RSM) . . . . . .... ... . . . . . . . . . . . . . . . . . .. . ... .. 19
6.2.1 Introduction . . . .... . . . . .. . . . . . . . . . . . . . ... ... . . . . . . . . . . ... .. .. . . . . . . 19
6.2.2 Asynchronous External RESET pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... . ... 20
6.2.3 Internal Low Voltage Detection RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... .. 20
6.2.4 Internal Watchdog RESET . . . . . . . . . . .... . ... .. .. .. .... . . . ... . . . . . . . . . . 20
6.3
MULTI-OSCILLATOR (MO) . . . . . . . . . . . . . . . .... ... . . . . . . . . . . . . . . . . . . . . ... .. 21
6.4
CLOCK SECURITY SYSTEM (CSS) . . . . . . . . .... ... . ... . . .. .. .. .. . . . . . . ... .. 22
6.4.1 Clock Filter Control . . .... . ... .. . . . . .... .... .. . . . . . . . . . . . . . ... .. . .... 22
6.4.2 Safe Oscillator Control . . . . .... . . ... .. ... .. .. . . . . . . . ... .. .. .... . . ... .. 22
6.4.3 Low Power Modes
. . .... . ... .. . . . . . ... . ... .. . . ... .. . .... . ... .. . . ... 22
6.4.4 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . .... . . . ... . . . . . . . . . . . . . ... ... . . . . 22
6.5
CLOCK RESET AND SUPPLY REGISTER DESCRIPTION (CRSR) . . . . . . . .... . ... 23
6.6
MAIN CLOCK CONTROLLER (MCC) . . . . . . . . . . . . .... . . . .... .... .. . .... .. . . . 24
7 INTERRUPTS . . .... .. . . . . . . . . .... . ... .. . . . . .... .... .. . .... .. . . . . . . ... .. . . . . . 25
7.1
NON MASKABLE SOFTWARE INTERRUPT . . . . . . .... .... ... . ... .. . . ... .. . . . 25
7.2
EXTERNAL INTERRUPTS . . . . . . . . . . . . . .... . ... .. . . . . .... . . . . .. . . . . . . . . . . 25
7.3
PERIPHERAL INTERRUPTS . . .... . . ... .. ... .. .. . . . . . . . ... .. .. .... . . ... .. 25
8 POWER SAVING MODES . . . . . . . . . . .... . . ... .. .... ... . . . . . . . . . . . . . . . . . .. . ... .. 27
8.1
INTRODUCTION . .... .. . .... . ... .. .. ... ... . . . . . . . . ... .. . . ... . ... . . . . ... 27
8.2
SLOW MODE . . . . . . . . . . . . . . .... . . ... .. ... .. .. . . . . . . . ... .. .. .... . . ... .. 27
8.3
WAIT MODE . . . . . . . . . . . .... . ... .. . . ... ... . ... .. . . ... .. . . ... . ... .. .. ... 28
8.4
HALT MODE . . . . . . . . . . . .... . ... .. . . . . .... .... .. . . . . . . . . . . . . . ... .. . .... 29
9 I/O PORTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . ... .. ... .. .. ... .. . ... .. . . ... . . 30
9.1
INTRODUCTION . .... .. . .... . ... .. .. ... ... . . . . . . . . ... .. . . ... . ... . . . . ... 30
9.2
FUNCTIONAL DESCRIPTION . . . . . . . ... . . . . . . . . . ... .. .. ... .. . ... .. . . ... .. 30
9.2.1 Input Modes . . . . . . . . . . . . . . . . . . . . . . .... . . . ... . . . . . . . . . . . . . ... .. . . .. . 30
9.2.2 Output Modes . . . . . . .... . ... ... . . . .... . . . . .. . . . . . . . . . . . . . ... .. . .... 30
9.2.3 Alternate Functions . . .... . ... .. . . . . .... .... .. . . . . . . . . . . . . . ... .. . .... 30
9.3
I/O PORT IMPLEMENTATION . . . . . . . ... . . . . . . . . . ... .. .. ... .. .. . . .. . . ... .. 33



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