P83C266BDR datasheet(19/92 Pages) PHILIPS

19 / 92 page

1999 Mar 10

Philips Semiconductors

Product speciﬁcation

Microcontrollers for PAL/SECAM TV

with OSD and VST

P8xCx66 family

Table 8

Selection of SCL frequency in Master mode

10.4

Status Register (S1STA)

S1STA is an 8-bit read-only Special Function Register. The contents of S1STA may be used as a vector to a service

routine. This optimizes response time of the software and consequently that of the I2C-bus. The status codes for all

possible modes of the I2C-bus interface are given in Table 12. The abbreviations used in Table 12 are defined in

Table 11.

Table 9

Status Register (SFR address D9H)

Table 10 Description of S1STA bits

Table 11 Abbreviations used in Table 12

CR2

CR1

CR0

fosc DIVISOR

BIT RATE (kHz) at fosc = 12 MHz

200

1600

7.5

300

400

240

3200

3.75

160

120

100

76543210

SC4

SC3

SC2

SC1

SC0

BIT

SYMBOL

DESCRIPTION

7 to 3

SC4 to SC0

5-bit status code; see Table 12.

2to0

−

These 3 bits are held LOW.

SYMBOL

DESCRIPTION

SLA

7-bit slave address

read bit

write bit

ACK

acknowledgment (Acknowledge bit = 0)

ACK

not acknowledge (Acknowledge bit = 1)

DATA

8-bit byte to or from the I2C-bus

MST

master

SLV

slave

TRX

transmitter

REC

receiver

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