PC87317 datasheet(77/272 Pages) NSC

77 / 272 page

Real-Time Clock (RTC) and Advanced Power Control (APC) (Logical Device 2)

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4.5.15

APC Status Register 1 (APSR1)

This is read-only register. The bit settings are unaffected by

Master Reset.

FIGURE 4-28. APSR1 Register Bitmap

Bit 0 - Switch Pin Status

This bit is holds the value of the SWITCH pin (before the

debouncer).

Bit 1 - Switch On event Detect

This bit is set to 1 when a Switch On event is detected,

regardless of the Power Button Enable bit (See “Bit 0 -

Power Button Enable (PWRBTN_EN)” on page 79). It is

cleared to 0 when the register is read.

Bits 7-2 - Reserved

4.5.16

Day-of-Month Alarm Address Register

(DADDR)

This register defines the Day-of-Month Alarm register loca-

tion. The bit settings are unaffected by Master Reset.

FIGURE 4-29. DADDR Register Bitmap

Bits 6-0 - Offset Address of the Day-of-Month Alarm

Bit 0 is the least significant bit of the address.

Bit 7 - Bank Select

0: Bank 0.

1: Bank 1.

Upon first power on, it is initialized to C9h.

4.5.17

Month Alarm Address Register (MADDR)

This register defines the Month Alarm register location. The

bit settings are unaffected by Master Reset.

FIGURE 4-30. MADDR Register Bitmap

Bits 6-0 - Offset Address of the Month Alarm Register

Bit 0 is the least significant bit of the address.

Bit 7 - Bank Select

0: Bank 0.

1: Bank 1.

Upon first power on, it is initialized to CAh.

4.5.18

Century Address Register (CADDR)

This register defines the Century register location. The bit

settings are unaffected by Master Reset.

FIGURE 4-31. CADDR Register Bitmap

Bits 6-0 - Offset Address of the Century Register

Bit 0 is the least significant bit of the address.

Bit 7 - Bank Select

0: Bank 0.

1: Bank 1.

Upon first power on, it is initialized to C8h.

Reserved

76543210

SWITCH pin status

Switch-On Event detect

Bank 2,

Power-Up

Required

APC Status

(APSR1)

Reset

Index 4Eh

Bank Select

76543210

Bank 2

Power-Up

Required

Day-of-Month Alarm Address

(DADDR)

Reset

Day-of-Month

Alarm Address

Index 4Fh

Bank Select

76543210

Bank 2

Power-Up

Required

Month Alarm Address

(MADDR)

Reset

Month

Alarm Address

Index 50h

Bank Select

76543210

Bank 2

Power-Up

Required

Century Address

(CADDR)

Reset

Century Address

Index 51h

PC87317 Datasheet(PDF) 77 Page - National Semiconductor (TI)

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