1996 Nov 21

8

Philips Semiconductors

Product specification

DTMF/modem/musical-tone generators

PCD3311C; PCD3312C

7.10

Power-on reset

In order to avoid an undefined state when the power is switched ON, the devices have an internal reset circuit which sets

the standby mode (oscillator OFF).

7.11

TABLES OF INPUT AND OUTPUT

The specified output tones are obtained when a 3.579545 MHz crystal is used.

In each table, the logical states for the input data lines are related to voltage levels as follows:

X = don’t care

Table 2

Input data for no output tone, TONE in 3-state

Note

1. The alternative HEX values depend on the value of D5.

D5

D4

D3

D2

D1

D0

OSCILLATOR

X

0

0

0

0

0

00 or 20

ON

X

0

0

0

0

1

01 or 21

OFF

X

0

0

0

1

0

02 or 22

OFF

X

0

0

0

1

1

03 or 23

OFF

handbook, full pagewidth

MGG512

S

010010

A0

0

A

X

X

D5

D4

D3

D2

D1

D0

A

P

slave address

data

R/W

MSB

acknowledge

from slave

acknowledge

from slave

internal STROBE

for data latching