PC87570 datasheet(7/168 Pages) NSC

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Table of Contents

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5.14.14 IRQ Enable Register (IRQE) ....................................................................................... 63

6.0

Real-Time Clock (RTC) and Advanced Power Control (APC)

6.1

FEATURES ................................................................................................................................ 64

6.2

RTC FUNCTIONAL DESCRIPTION .......................................................................................... 64

6.2.1

Host Bus Interface ....................................................................................................... 64

6.2.2

Core Bus Interface ....................................................................................................... 64

6.2.3

Bank Description ......................................................................................................... 64

6.2.4

Bank Accessing ........................................................................................................... 64

6.2.5

RTC Clock Generation ................................................................................................ 64

6.2.6

Internal Oscillator ......................................................................................................... 65

6.2.7

External Oscillator ....................................................................................................... 65

6.2.8

Timing Generation ....................................................................................................... 65

6.2.9

Timekeeping ................................................................................................................66

6.2.10

Updating ...................................................................................................................... 66

6.2.11

Alarms ......................................................................................................................... 67

6.2.12

Power Supply ..............................................................................................................67

6.2.13

System Bus Lockout .................................................................................................... 68

6.2.14

Power-Up Detection .................................................................................................... 68

6.2.15

Oscillator Activity ......................................................................................................... 68

6.2.16

Interrupt Handling ........................................................................................................68

6.2.17

Battery-Backed Register Banks and RAM ................................................................... 68

6.3

RTC REGISTERS ...................................................................................................................... 69

6.3.1

RTC Control Register A (CRA) .................................................................................... 69

6.3.2

RTC Control Register B (CRB) .................................................................................... 70

6.3.3

RTC Control Register C (CRC) ................................................................................... 70

6.3.4

RTC Control Register D (CRD) ................................................................................... 71

6.4

USAGE HINTS .......................................................................................................................... 71

6.5

APC FUNCTIONAL DESCRIPTION .......................................................................................... 71

6.5.1

Operation ..................................................................................................................... 71

6.5.2

User Selectable Parameters ........................................................................................ 71

6.5.3

System Power States .................................................................................................. 71

6.5.4

System Power Switching Logic ................................................................................... 72

6.5.5

APC-ON/APC-OFF Interrupt Signals ........................................................................... 72

6.5.6

Entering Power States ................................................................................................. 72

6.5.7

Predetermined Wake-Up ............................................................................................. 72

6.5.8

Ring Signal Event ........................................................................................................ 72

6.6

APC REGISTERS ...................................................................................................................... 72

6.6.1

APC Control Register 1 (APCR1) ................................................................................ 73

6.6.2

APC Control Register 2 (APCR2) ................................................................................ 73

6.6.3

APC Status Register (APSR) ...................................................................................... 73

6.6.4

RAM Lock Register (RLR) ........................................................................................... 73

6.7

REGISTER BANKS ................................................................................................................... 74

7.0

High Frequency Clock Generator (HFCG)

7.1

FEATURES ................................................................................................................................ 76

PC87570 Datasheet(PDF) 7 Page - National Semiconductor (TI)

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