SC2200 datasheet(120/433 Pages) NSC

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120

Revision 3.0

SuperI/O Module (Continued)

4.5.3

RTC Registers

The RTC registers can be accessed (see Section 4.4.2.1

"LDN 00h - Real-Time Clock" on page 107) at any time dur-

ing normal operation mode (i.e.,when VSB is within the rec-

ommended operation range). This access is disabled

during battery-backed operation. The write operation to

these registers is also disabled if bit 7 of the CRD Register

is 0.

Note:

Before attempting to perform any start-up proce-

dures, read about bit 7 (VRT) of the CRD Register.

This section describes the RTC Timing and Control Regis-

ters that control basic RTC functionality.

Table 4-19. RTC Register Map

Index

Type

Name

Reset

Type

00h

R/W

SEC. Seconds Register

VPP PUR

01h

R/W

SECA. Seconds Alarm Register

VPP PUR

02h

R/W

MIN. Minutes Register

VPP PUR

03h

R/W

MINA. Minutes Alarm Register

VPP PUR

04h

R/W

HOR. Hours Register

VPP PUR

05h

R/W

HORA. Hours Alarm Register

VPP PUR

06h

R/W

DOW. Day Of Week Register

VPP PUR

07h

R/W

DOM. Date Of Month Register

VPP PUR

08h

R/W

MON. Month Register

VPP PUR

09h

R/W

YER. Year Register

VPP PUR

0Ah

R/W

CRA. RTC Control Register A

Bit specific

0Bh

R/W

CRB. RTC Control Register B

Bit specific

0Ch

CRC. RTC Control Register C

Bit specific

0Dh

CRD. RTC Control Register D

VPP PUR

Programmable1

R/W

DOMA. Date of Month Alarm Register

VPP PUR

Programmable1

R/W

MONA. Month Alarm Register

VPP PUR

Programmable1

R/W

CEN. Century Register

VPP PUR

Overlaid on RAM bytes in range 0Eh-7Fh. See Section 4.4.2.1 "LDN 00h - Real-Time Clock" on page 107.

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