SAA5502PS datasheet(21/80 Pages) PHILIPS

21 / 80 page

1999 Oct 27

Philips Semiconductors

Preliminary speciﬁcation

Standard TV microcontrollers with

On-Screen Display (OSD)

SAA55xx

Serial Interrupt ﬂag. This ﬂag is set and an interrupt request is generated, after

any of the following events occur:

• A START condition is generated in master mode

• The own slave address has been received during AA = 1

• The general call address has been received while S1ADR.GC and AA = 1

• A data byte has been received or transmitted in master mode (even if arbitration

is lost)

• A data byte has been received or transmitted as selected slave

• A STOP or START condition is received as selected slave receiver or

transmitter. While the SI ﬂag is set, SCL remains LOW and the serial transfer is

suspended. SI must be reset by software.

Assert Acknowledge ﬂag. When this bit is set, an acknowledge is returned

after any one of the following conditions:

• Own slave address is received

• General call address is received (S1ADR.GC = 1)

• A data byte is received, while the device is programmed to be a master receiver

• A data byte is received, while the device is selected slave receiver.

When the bit is reset, no acknowledge is returned. Consequently, no interrupt is

requested when the own address or general call address is received.

I2C-bus Data Register (S1DAT)

DAT7 to DAT0

I2C-bus data

I2C-bus Status Register (S1STA)

STAT4 to STAT0

I2C-bus interface status

Software ADC Register (SAD)

VHI

analog input voltage greater than DAC voltage (logic 1)

CH1 to CH0

ADC input channel select bits; CH<1:0>:

00 = ADC3

01 = ADC0

10 = ADC1

11 = ADC2

ST(1)

initiate voltage comparison between ADC input channel and SAD value

SAD7 to SAD4

4 MSBs of DAC input word

Software ADC Control Register (SADB)

DC_COMP

enable DC comparator mode (logic 1)

SAD3 to SAD0

4 LSBs of SAD value

Stack Pointer (SP)

SP7 to SP0

stack pointer value

BIT

FUNCTION

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