AS3543 datasheet(86/92 Pages) AMSCO

86 / 92 page

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Revision 1.11

85 - 91

AS3543 3v2

Data Sheet - R e g i s t e r D e f i n i t i o n

Table 87. RTC_Cntr Register

Name

Base

Default

RTC_Cntr

2-wire serial

03h

Offset: 28h

RTC Control Register

This register is reset at a RVDD-POR.

Bit

Bit Name

Default

Access

Bit Description

7:4

Free_Bits<3:0>

0000

R/W

Free Bits to be used for application purpose

3:2

n/a

RTC_ON

R/W

RTC counter clock control:

0: Disable clock for RTC counter

1: Enables clock for RTC counter

OSC_ON

RTC oscillator control:

0: Disable RTC oscillator

1: Enable RTC oscillator

Table 88. RTC_Time Register

Name

Base

Default

RTC_time

2-wire serial

03h

Offset: 29h

RTC Timing Register

This register is reset at a RVDD-POR.

Bit

Bit Name

Default

Access

Bit Description

IRQ_MIN

R/W

0: generates an interrupt every second

1: generates an interrupt every minute

The interrupt has to be enable in IRQENRD_4 (27h)

6:0

TRTC<6:0>

1000000

R/W

These bits are used to correct the inaccuracy of the used

32kHz crystal.

Trimming register for RTC, 128 steps @ 7.6ppm

000000: 1 (7.6ppm)

000001: 2 (15.2ppm)

…

100000: 64 (488ppm)

…

111110: 126 (960.8ppm)

111111: 127 (968.4ppm)

Table 89. RTC_0 to RTC_3 Register

Name

Base

Default

RTC_0 to RTC_3

2-wire serial

03h

Offset: 2Ah to 2Dh

RTC Counter Seconds Register

This register is reset at a RVDD-POR.

Adr.

Byte Name

Default

Access

Bit Description

2Ah

RTC_0

00h

R/W

QRTC<7:0>; RTC seconds bits 0 to 7

2Bh

RTC_1

00h

R/W

QRTC<15:8>; RTC seconds bits 8 to 15

2Ch

RTC_2

00h

R/W

QRTC<23:9>; RTC seconds bits 9 to 23

2Dh

RTC_3

00h

R/W

QRTC<31:24>; RTC seconds bits 24 to 31

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