1998 Jul 03

16

Philips Semiconductors

Product specification

TV and VTR stereo/dual sound processor

TDA9840

X is the read/write control bit; X = 0, order to write (the circuit is slave receiver); X = 1, order to read (the circuit is slave

transmitter). If more than 1 byte of DATA is transmitted, then auto-increment of the significant subaddress is performed.

Table 2

Table 3

Explanation of Table 2

Table 4

Table 5

Explanation of Table 4

S

SLAVE ADDRESS

A

SUBADDRESS

A

DATA

P

BIT

FUNCTION

S

start condition

SLAVE ADDRESS

1000 010X

A

acknowledge, generated by the slave

SUBADDRESS

dual sound A/B

DATA

data byte; see Table 6

P

stop condition

FUNCTION

SLAVE

ADDRESS

DATA

D7

D6

D5

D4

D3

D2

D1

D0

Status byte

1000 0101

PONRES

ST

DS

00000

BIT

FUNCTION

PONRES = 0

after a successful reading of the status register

PONRES = 1

after power-on reset or after supply breakdown

ST = 0; DS = 0

MONO sound identified

ST = 0; DS = 1

DUAL sound identified

ST = 1; DS = 0

STEREO sound identified

ST = 1; DS = 1

incorrect identification