ADUC7023BCBZ62I-R7 datasheet(68/98 Pages) AD

68 / 98 page

ADuC7023

Data Sheet

Rev. H | Page 68 of 98

Bit

Name

Description

I2CSTFE

I2C slave FIFO underflow status bit.

This bit goes high if the Tx FIFO is empty when a master requests data from the slave. This bit is asserted

at the rising edge of SCL during the read bit.

This bit is cleared in all other conditions.

I2CETSTA

I2C slave early transmit FIFO status bit.

If the I2CSETEN bit in I2CxSCON is = 0, this bit goes high if the slave Tx FIFO is empty. If the I2CSETEN bit in

I2CxSCON is = 1, this bit goes high just after the positive edge of SCL during the write bit transmission.

This bit asserts once only for a transfer.

This bit is cleared after being read.

I2C Slave Receive Registers, I2CxSRX

Name:

I2C0SRX, I2C1SRX

Address:

0xFFFF0830, 0xFFFF0930

Default value:

0x00

Access:

Read

Function:

These 8-bit MMRs are the I2C slave receive

I2C Slave Transmit Registers, I2CxSTX

Name:

I2C0STX, I2C1STX

Address:

0xFFFF0834, 0xFFFF0934

Default value:

0x00

Access:

Write

Function:

These 8-bit MMRs are the I2C slave transmit

registers.

I2C Hardware General Call Recognition Registers,

I2CxALT

Name:

I2C0ALT, I2C1ALT

Address:

0xFFFF0838, 0xFFFF0938

Default value:

0x00

Access:

Read/write

Function:

These 8-bit MMRs are used with hardware

general calls when the I2CxSCON Bit 3 is set to

1. These registers are used in cases where a

master is unable to generate an address for a

slave, and instead, the slave must generate the

address for the master.

I2C Slave Device ID Registers, I2CxIDx

Name:

I2C0IDx, I2C1IDx

Addresses:

0xFFFF093C = I2C1ID0

0xFFFF083C = I2C0ID0

0xFFFF0940 = I2C1ID1

0xFFFF0840 = I2C0ID1

0xFFFF0944 = I2C1ID2

0xFFFF0844 = I2C0ID2

0xFFFF0948 = I2C1ID3

0xFFFF0848 = I2C0ID3

Default value:

0x00

Access:

Read/write

Function:

These 8-bit MMRs are programmed with I2C

bus IDs of the slave. See the I2C Bus Addresses

section for further details.

I2C Common Registers

I2C FIFO Status Registers, I2CxFSTA

Name:

I2C0FSTA, I2C1FSTA

Address:

0xFFFF084C, 0xFFFF094C

Default value:

0x0000

Access:

Read/write

Function:

These 16-bit MMRs contain the status of the

Rx/Tx FIFOs in both master and slave modes.

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