PC87307 datasheet(65/218 Pages) NSC

65 / 218 page

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

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TABLE 4-8. Bank 1 Registers, RTC Memory Bank

TABLE 4-9. Bank 2 Registers, APC Memory Bank

TABLE 4-10. Available General Purpose Bytes

Index

Type

Power-on Value

Function

00h-3Fh

Banks 0, 1 and 2 share the ﬁrst 14 RTC registers and the

ﬁrst 50 RTC RAM bytes.

40h-47h

Reserved. Writes have no effect and reads return 00h

Century

48h

R/W

00h

BCD Format: 00-99. Binary Format: 00-63

49h-4Fh

Reserved

Upper RAM

Address Port

50h

R/W

Bits 6-0: Address of the upper 128 RAM bytes.

Bit 7: Reserved.

51h-52h

Reserved

Upper RAM Data

Port

53h

R/W

The byte pointed by the Upper RAM Address Port is

accessed via this register.

54h-7Fh

Reserved

Index

Type

Power-On Value

Function

00h - 3Fh

Banks 0, 1 and 2 share the ﬁrst 14 RTC

registers and the ﬁrst 50 bytes of RTC RAM.

APC Control Register 1

(APCR1)

40h

R/W

00h

See “APC Control Register 1 (APCR1), Index

40h” on page 60

APC Control Register 2

(APCR2)

41h

R/W

00h

See “APC Control Register 2 (APCR2), Index

41h” on page 61

APC Status Register (APSR)

42h

1000001 (binary)

(bit 7 is indeterminate)

See “APC Status Register (APSR), Index

42h” on page 61

Wake Up Day of Week

43h

R/W

BCD Format: 01-07

Binary Format: 01-07 (Sunday = 1)

Wake Up Date of Month

44h

R/W

BCD Format: 01-31

Binary Format: 01-1F

Wake Up Month

45h

R/W

BCD Format: 01-12

Binary Format: 01-0C

Wake Up Year

46h

R/W

BCD Format: 00-99

Binary Format: 00-63

RAM Lock

47h

R/W

00h;

initialized also on MR

pin reset.

See “RAM Lock Register (RLR), Index 47h”

on page 62

Wake Up Century

48h

R/W

BCD Format: 00-99

Binary Format: 00-63

49h-7Fh

Reserved

Index

Bank

Number of Bytes

Notes

0Eh - 3Fh

All

40h - 7Fh

Bank 0

50h, 53h

Bank 1

128

Indirect access via 50h for address and 53h for data.

Total

242

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