CS5535 datasheet(422/555 Pages) NSC

422 / 555 page

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422

Revision 0.8

RTC Register Descriptions (Continued)

5.15.1 RTC Specific MSRs

5.15.1.1

RTC RAM Lock (RTC_RAM_LOCK)

When a non-reserved bit is set to 1, it can only be cleared by hardware reset.

5.15.1.2

RTC Date of Month Alarm Offset (RTC_DOMA_OFFSET)

MSR Address

51400054h

Type

R/W

Reset Value

00h

RTC_RAM_LOCK Register Map

76543

210

BLK_STDRAM BLK_RAM_WR BLK_XRAM_WR BLK_XRAM_RD

BLK_XRAM

RSVD

RTC_RAM_LOCK Bit Descriptions

Bit

Name

Description

BLK_STDRAM

Block Standard RAM.

0: No effect on Standard RAM access (default).

1: Read and write to locations 38h-3Fh of the Standard RAM are blocked, writes

ignored, and reads return FFh.

BLK_RAM_WR

Block RAM Write.

0: No effect on RAM access (default).

1: Write to RAM (Standard and Extended) are ignored.

BLK_XRAM_WR

Block Extended RAM Write. This bit controls write to bytes 00h-1Fh of the Extended

RAM.

0: No effect on Extended RAM access (default).

1: Writes to byte 00h-1Fh of the Extended RAM are ignored.

BLK_XRAM_RD

Block Extended RAM Read. This bit controls read from bytes 00h-1Fh of the

Extended RAM.

0: No effect on Extended RAM access (default).

1: Reads from byte 00h-1Fh of the Extended RAM are ignored.

BLK_XRAM

Block Extended RAM. This bit controls access to the Extended RAM 128 bytes.

0: No effect on Extended RAM access (default).

1: Read and write to the Extended RAM are blocked; writes are ignored and reads

return FFh.

2:0

RSVD

Reserved. Write as 0.

MSR Address

51400055h

Type

R/W

Reset Value

00h

RTC_DOMA_OFFSET Register Map

76543

210

RSVD

DOMA_OFST

CS5535 Datasheet(PDF) 422 Page - National Semiconductor (TI)

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