UPSD3312D datasheet(130/272 Pages) STMICROELECTRONICS

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I2C interface

UPSD33xx

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Doc ID 9685 Rev 7

Table 74.

S1STA: I2C Interface Status register (SFR DDh, reset value 00h)

Table 75.

S1STA register bit definition

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

STOP

INTR

TX_MODE

BBUSY

BLOST

ACK_RESP

SLV

Bit

Symbol

R/W

Function

7GC

General Call flag

GC = 1 if the General Call address of 00h was received when SIOE is in

Slave mode, and GC is cleared by a START or STOP condition on the

bus. If the SIOE is in Master mode when GC = 1, the Bus Lost condition

exists, and BLOST = 1.

6STOP

STOP flag

STOP = 1 while SIOE detects a STOP condition on the bus when in

Master or Slave mode.

5INTR

R,W

Interrupt flag

INTR is set to 1 by any of the five I2C interrupt conditions listed above.

INTR must be cleared by firmware.

4TX_MODE

Transmission Mode flag

TX_MODE = 1 whenever the SIOE is in Master-Transmitter or Slave-

Transmitter mode. TX_MODE = 0 when SIOE is in any receiver mode.

3BBUSY

Bus Busy flag

BBUSY = 1 when the I2C bus is in use. BBUSY is set by the SIOE when

a START condition exists on the bus and BBUSY is cleared by a STOP

condition.

2BLOST

Bus Lost flag

BLOST is set when the SIOE is in Master mode and it looses the

arbitration process to another Master device on the bus.

ACK_RESP

Not Acknowledge Response flag

While SIOE is in Transmitter mode:

– After SIOE sends a byte, ACK_RESP = 1 whenever the external I2C

device receives the byte, but that device does NOT assert an

accolade signal (external device asserted a high on SDA during the

acknowledge bit-time).

– After SIOE sends a byte, ACK_RESP = 0 whenever the external I2C

device receives the byte, and that device DOES assert an accolade

signal (external device drove a low on SDA during the acknowledge

bit-time)

Note: If SIOE is in Master-Transmitter mode, and ACK_RESP = 1 due to

a Slave-Transmitter not sending an Acknowledge, a STOP condition will

not automatically be generated by the SIOE. The STOP condition must

be generated with S1CON.STO = 1.

0SLV

Slave Mode flag

SLV = 1 when the SIOE is in Slave mode. SLV = 0 when the SIOE is in

Master mode (default).

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