1997 Mar 28

12

Philips Semiconductors

Product specification

Clock/calendar with Power Fail Detector

PCF8573

Acknowledgement response of the PCF8573 as slave-receiver is shown in Table 6. Note that data is only associated

with the ‘execute address’ function where C0, C1, C2 = 0, 0, 0.

Table 6

Slave receiver acknowledgement; note 1

Note

1. ‘X’ is ‘don’t care’.

To read the addressed part of the time counter and alarm register, plus information from specified control/status flags,

the BCD digits in the DATA byte are organized as shown in Table 7.

The status of the CONTROL-nibble of the MODE-POINTER-WORD (C2, C1, C0) remains unchanged until re-written.

Table 7

Organization of the BCD digits in the DATA byte; note 1

Note

1. ‘D’ is the data bit; ‘m’ = minutes; ‘s’ = seconds.

MODE POINTER

ACKNOWLEDGE ON BYTE:

ADDRESS

MODE POINTER

DATA

BIT 8

C2

C1

C0

BIT 4

B2

B1

B0

0

0

0

0

0

X

X

X

yes

yes

yes

0

0

0

0

1

X

X

X

yes

no

no

0

0

0

1

X

X

X

X

yes

yes

no

0

0

1

0

X

X

X

X

yes

yes

no

0

0

1

1

X

X

X

X

yes

yes

no

0

1

0

0

X

X

X

X

yes

yes

no

0

1

0

1

X

X

X

X

yes

yes

no

0

1

1

0

X

X

X

X

yes

yes

no

0

1

1

1

X

X

X

X

yes

no

no

1

X

X

X

X

X

X

X

yes

no

no

MSB

DATA

LSB

UPPER DIGIT

LOWER DIGIT

UD

UC

UB

UA

LD

LC

LB

LA

ADDRESSED TO:

0

0

D

D

D

D

D

D

hours

0

D

D

D

D

D

D

D

minutes

0

0

D

D

D

D

D

D

days

0

0

0

D

D

D

D

D

months

0

0

0

m

s

NODA

COMP

POWF

control/status flags