ST7LITE49K2 datasheet(3/245 Pages) STMICROELECTRONICS

Nome de Peças	ST7LITE49K2

Descrição Electrónicos	Communication interfaces

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Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

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ST7LITE49K2

Contents

3/245

6

Central processing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

6.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

6.2

Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

6.3

CPU registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

6.3.1

Accumulator (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6.3.2

Index registers (X and Y) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6.3.3

Program counter (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6.3.4

Condition code register (CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6.3.5

Stack pointer (SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

7

Supply, reset and clock management . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.1

RC oscillator adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.1.1

Internal RC oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.1.2

Auto-wakeup RC oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.2

Multi-oscillator (MO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.2.1

External clock source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.2.2

Crystal/ceramic oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.2.3

Internal RC oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.3

Reset sequence manager (RSM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

7.3.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

7.3.2

Asynchronous external RESET pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

7.3.3

External power-on reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

7.3.4

Internal low voltage detector (LVD) reset . . . . . . . . . . . . . . . . . . . . . . . . 45

7.3.5

Internal watchdog reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

7.4

System integrity management (SI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

7.4.1

Low voltage detector (LVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

7.4.2

Auxiliary voltage detector (AVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

7.4.3

Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

7.5

Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

7.5.1

Main clock control/status register (MCCSR) . . . . . . . . . . . . . . . . . . . . . 50

7.5.2

RC control register (RCCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

7.5.3

System integrity (SI) control/status register (SICSR) . . . . . . . . . . . . . . . 51

7.5.4

AVD threshold selection register (AVDTHCR) . . . . . . . . . . . . . . . . . . . . 52

7.5.5

Clock controller control/status register (CKCNTCSR) . . . . . . . . . . . . . . 53

8

Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Nº de peça semelhante - ST7LITE49K2

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