PC87307VUL National Semiconductor, PC87307VUL Datasheet - Page 65

• Manufacturer Part Number: PC87307VUL
• Description: PC87307/PC97307 Plug and Play Compatible and PC97 Compliant SuperI/O
• Manufacturer: National Semiconductor

APC Control Register 1
(APCR1)
APC Control Register 2
(APCR2)
APC Status Register (APSR)
RAM Lock
Wake Up Century
Century
Upper RAM
Address Port
Upper RAM Data
Port
Wake Up Day of Week
Wake Up Date of Month
Wake Up Month
Wake Up Year
Register
0Eh - 3Fh
40h - 7Fh
50h, 53h
Index
Register
Total
Real-Time Clock (RTC) and Advanced Power Control (APC) (Logical Device 2)
00h-3Fh
49h-4Fh
54h-7Fh
40h-47h
51h-52h
Index
48h
50h
53h
Bank 0
Bank 1
Bank
All
00h - 3Fh
49h-7Fh
TABLE 4-8. Bank 1 Registers, RTC Memory Bank
TABLE 4-9. Bank 2 Registers, APC Memory Bank
Index
TABLE 4-10. Available General Purpose Bytes
40h
41h
42h
43h
44h
45h
46h
47h
48h
Type
R/W
R/W
R/W
Number of Bytes
Power-on Value
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
128
242
50
64
00h
(bit 7 is indeterminate)
initialized also on MR
Power-On Value
1000001 (binary)
pin reset.
65
00h;
00h
00h
Banks 0, 1 and 2 share the first 14 RTC registers and the
first 50 RTC RAM bytes.
Reserved. Writes have no effect and reads return 00h
BCD Format: 00-99. Binary Format: 00-63
Reserved
Bits 6-0: Address of the upper 128 RAM bytes.
Bit 7: Reserved.
Reserved
The byte pointed by the Upper RAM Address Port is
accessed via this register.
Reserved
Indirect access via 50h for address and 53h for data.
Banks 0, 1 and 2 share the first 14 RTC
registers and the first 50 bytes of RTC RAM.
See “APC Control Register 1 (APCR1), Index
40h” on page 60
See “APC Control Register 2 (APCR2), Index
41h” on page 61
See “APC Status Register (APSR), Index
42h” on page 61
BCD Format: 01-07
Binary Format: 01-07 (Sunday = 1)
BCD Format: 01-31
Binary Format: 01-1F
BCD Format: 01-12
Binary Format: 01-0C
BCD Format: 00-99
Binary Format: 00-63
See “RAM Lock Register (RLR), Index 47h”
on page 62
BCD Format: 00-99
Binary Format: 00-63
Reserved
Notes
Function
Function
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