DP8573AVSLASHNOPB datasheet(14/18 Pages) TI2

14 / 18 page

Control and Status Register Address Bit Map

1 Reset by

Main Status Register

PS e XRS e X

ADDRESS e 00H

writing

RW1

1 to bit

RAM

Alarm

Periodic

Power Fail

Interrupt

2 Setreset by

Select

Interrupt

Status

voltage at

PFAIL pin

3 Reset when

all pending

interrupts

are removed

Periodic Flag Register

PS e 0RS e 0

Address e 03H

4 Read Osc fail

RW4

Write 0 Batt-

Test

Osc Fail

1 ms

10 ms

100 ms

Seconds

10 Second

Minute

Backed Mode

Mode

Single Supply

Flag

Write 1 Single

Supply Mode

5 Reset by

positive edge

of read

Time Save Control Register

PS e 0RS e 0 Address e 04H

Time Save

RAM

All Bits RW

Enable

Real Time Mode Register

PS e 0RS e 1

Address e 01H

RAM

Interrupt EN

Clock

1224 Hr

Leap Year

All Bits RW

on Back-Up

StartStop

Mode

MSB

LSB

Output Mode Register

PS e 0RS e 1

Address e 02H

MFO as

RAM

All Bits RW

Crystal

Interrupt Control Register 0

PS e 0RS e 1

Address e 03H

1 ms

10 ms

100 ms

Seconds

10 Second

Minute

RAM

Interrupt

All Bits RW

Enable

Interrupt Control Register 1

PS e 0RS e 1

Address e 04H

Power Fail

Alarm

DOW

Month

DOM

Hours

Minute

Second

Interrupt

All Bits RW

Enable

Application Hints

Suggested Initialization Procedure for DP8573A in Bat-

tery Backed Applications that use the VBB Pin

Enter the test mode by writinga1tobit D7 in the Period-

ic Flag Register

Write zero to the RAMTEST mode Register located in

page 0 address HEX 1F

Leave the test mode by writinga0tobit D7 in the Peri-

odic Flag Register Steps 1 2 3 guarantee that if the

test mode had been entered during power on (due to

random pulses from the system) all test mode condi-

tions are cleared Most important is that the OSC Fail

Disable bit is cleared Refer to AN-589 for more informa-

tion on test mode operation

Enter a software loop that does the following

Set a 3 second(approx) software counter The crystal

oscillator may take 1 second to start

41 Writea1tobit D3 in the Real Time Mode Register (try

to start the clock) Under normal operation this bit can

be set only if the oscillator is running During the soft-

ware loop RAM real time counters output configura-

tion interrupt control and timer functions may be initial-

ized

DP8573AV/NOPB датащи(PDF) 14 Page - Texas Instruments

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