ST72321R7-Auto datasheet(165/243 Pages) STMICROELECTRONICS

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ST72321xx-Auto

I2C bus interface (I2C)

Doc ID 13829 Rev 1

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16.7.2

I2C status register 1 (SR1)

1STOP

Generation of a Stop condition

This bit is set and cleared by software. It is also cleared by hardware in master

mode.

Note: This bit is not cleared when the interface is disabled (PE = 0).

In Master mode

0: No stop generation

1: Stop generation after the current byte transfer or after the current Start condition

is sent. The STOP bit is cleared by hardware when the Stop condition is sent.

In Slave mode

0: No stop generation

1: Release the SCL and SDA lines after the current byte transfer (BTF = 1). In this

mode the STOP bit has to be cleared by software.

0ITE

Interrupt enable

This bit is set and cleared by software and cleared by hardware when the interface

is disabled (PE = 0).

0: Interrupts disabled

1: Interrupts enabled

Refer to Figure 69 and Table 82 for the relationship between the events and the

interrupt.

SCL is held low when the ADD10, SB, BTF or ADSL flags or an EV6 event (see

Figure 68) is detected.

Table 83.

CR register description (continued)

Bit

Name

Function

SR1

Reset value: 0000 0000 (00h)

543

EVF

ADD10

TRA

BUSY

BTF

ADSL

M/SL

Table 84.

SR1 register description

Bit

Name

Function

7EVF

Event flag

This bit is set by hardware as soon as an event occurs. It is cleared by software

reading SR2 register in case of error event or as described in Figure 68. It is also

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

0: No event

1: One of the following events has occurred:

- BTF = 1 (Byte received or transmitted)

- ADSL = 1 (Address matched in Slave mode while ACK = 1)

- SB = 1 (Start condition generated in Master mode)

- AF = 1 (No acknowledge received after byte transmission)

- STOPF = 1 (Stop condition detected in Slave mode)

- ARLO = 1 (Arbitration lost in Master mode)

- BERR = 1 (Bus error, misplaced Start or Stop condition detected)

- ADD10 = 1 (Master has sent header byte)

- Address byte successfully transmitted in Master mode

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