P80CL410 datasheet(21/60 Pages) PHILIPS

21 / 60 page

1997 Apr 10

Philips Semiconductors

Product speciﬁcation

Low voltage 8-bit microcontrollers with

I2C-bus

P80CL410; P83CL410

Table 7

Selection of the serial clock frequency SCL in a Master mode of operation

13.2

Serial Status Register (S1STA)

S1STA is a read-only register. The contents of this register may be used as a vector to a service routine. This optimizes

the 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 Tables 10 to 14.

Table 8

Serial Status Register (address D9H)

Table 9

Description of S1STA bits

Table 10 MST/TRX mode

CR2

CR1

CR0

fosc DIVISOR

BIT RATE (kHz) at fosc

3.58 MHz

6 MHz

12 MHz

256

14.0

23.4

46.9

224

16.0

26.8

53.6

192

18.6

31.3

62.5

160

22.4

37.5

75.0

960

3.73

6.25

12.5

120

29.8

50.0

100.0

59.7

100.0

−

not allowed

−−−

76543210

SC4

SC3

SC2

SC1

SC0

BIT

SYMBOL

DESCRIPTION

3 to 7

SC4 to SC0

5-bit status code

0 to 2

−

these three bits are always zero

S1STA VALUE

DESCRIPTION

08H

a START condition has been transmitted

10H

a repeated START condition has been transmitted

18H

SLA and W have been transmitted, ACK has been received

20H

SLA and W have been transmitted, ACK received

28H

DATA of S1DAT has been transmitted, ACK received

30H

DATA of S1DAT has been transmitted, ACK received

38H

arbitration lost in SLA, R/W or DATA

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