ST7263B datasheet(83/132 Pages) STMICROELECTRONICS

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ST7263B

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I²C BUS INTERFACE (Cont’d)

I²C STATUS REGISTER 2 (SR2)

Read Only

Reset Value: 0000 0000 (00h)

Bits 7:5 = Reserved. Forced to 0 by hardware.

Bit 4 = AF

Acknowledge failure.

This bit is set by hardware when no acknowledge

is returned. An interrupt is generated if ITE=1. It is

cleared by software reading SR2 register or by

hardware when the interface is disabled (PE=0).

The SCL line is not held low while AF=1.

0: No acknowledge failure

1: Acknowledge failure

Bit 3 = STOPF

Stop detection (Slave mode).

This bit is set by hardware when a Stop condition

is detected on the bus after an acknowledge (if

ACK=1). An interrupt is generated if ITE=1. It is

cleared by software reading SR2 register or by

hardware when the interface is disabled (PE=0).

The SCL line is not held low while STOPF=1.

0: No Stop condition detected

1: Stop condition detected

Bit 2 = ARLO

Arbitration lost.

This bit is set by hardware when the interface los-

es the arbitration of the bus to another master. An

interrupt is generated if ITE=1. It is cleared by soft-

ware reading SR2 register or by hardware when

the interface is disabled (PE=0).

After an ARLO event the interface switches back

automatically to Slave mode (M/SL=0).

The SCL line is not held low while ARLO=1.

0: No arbitration lost detected

1: Arbitration lost detected

Bit 1 = BERR

Bus error.

This bit is set by hardware when the interface de-

tects a misplaced Start or Stop condition. An inter-

rupt is generated if ITE=1. It is cleared by software

reading SR2 register or by hardware when the in-

terface is disabled (PE=0).

The SCL line is not held low while BERR=1.

0: No misplaced Start or Stop condition

1: Misplaced Start or Stop condition

Bit 0 = GCAL

General Call (Slave mode).

This bit is set by hardware when a general call ad-

dress is detected on the bus while ENGC=1. It is

cleared by hardware detecting a Stop condition

(STOPF=1) or when the interface is disabled

(PE=0).

0: No general call address detected on bus

1: general call address detected on bus

STOPF ARLO

BERR GCAL

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