CS5535 datasheet(430/555 Pages) NSC

430 / 555 page

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430

Revision 0.8

RTC Register Descriptions (Continued)

5.15.2.15 Date of Month Alarm (RTC_DOMA)

5.15.2.16 Month Alarm (RTC_MONA)

RTC_CRD Bit Descriptions

Bit

Name

Description

7VRT (RO)

Valid RAM and Time (Read Only). This bit senses the voltage that feeds the RTC

(VSB or VBAT) and indicates whether or not it was too low since the last time this bit

was read. If it was too low, the RTC contents (time/calendar registers and CMOS RAM)

is not valid. It is clear on VPP power-up.

0: The voltage that feeds the RTC was too low.

1: RTC contents (time/calendar registers and CMOS RAM) valid.

6:0

RSVD (RO)

Reserved (Read Only). Reads as 0.

I/O Address

Programmable

Type

R/W

Reset Value

00h

RTC_DOMA Register Map

76543

210

DOMA_DATA

RTC_DOMA Bit Descriptions

Bit

Name

Description

7:0

DOMA_DATA

Date of Month Alarm Data. Values may be 01 to 31 in BCD format or 01 to 1F in

binary format. When bits 7 and 6 are both set to one, an unconditional match is

selected (default). Reset by VPP power-up.

I/O Address

Programmable

Type

R/W

Reset Value

00h

RTC_MONA Register Map

76543

210

MONA_DATA

RTC_MONA Bit Descriptions

Bit

Name

Description

7:0

MONA_DATA

Month Alarm Data. Values may be 01 to 12 in BCD format or 01 to 0C in binary format.

When bits 7 and 6 are both set to one, an unconditional match is selected (default).

Reset by VPP power-up.

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