Datasheet

ADuC7060/ADuC7061 Data Sheet
Rev. D | Page 94 of 108
Bit Name Description
2 I2CSTXQ I
2
C slave transmit request bit.
This bit is set to 1 when the slave receives a matching address followed by a read. If the I2CSETEN bit in I2CSCON
is =0, this bit goes high just after the negative edge of SCL during the read bit transmission. If the I2CSETEN bit in
I2CSCON is =1, this bit goes high just after the positive edge of SCL during the read bit transmission. This bit
causes an interrupt to occur if the I2CSTXENI bit in I2CSCON is set.
This bit is cleared in all other conditions.
1 I2CSTFE I
2
C slave FIFO underflow status bit.
This bit goes high if the transmit 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.
0 I2CETSTA I
2
C slave early transmit FIFO status bit.
If the I2CSETEN bit in I2CSCON is =0, this bit goes high if the slave transmit FIFO is empty. If the I2CSETEN bit in
I2CSCON = 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.
I
2
C Slave Receive, I2CSRX, Register
Name: I2CSRX
Address: 0xFFFF0930
Default value: 0x00
Access: Read only
Function: This 8-bit MMR is the I
2
C slave receive register.
I
2
C Slave Transmit, I2CSTX, Register
Name: I2CSTX
Address: 0xFFFF0934
Default value: 0x00
Access: Write only
Function: This 8-bit MMR is the I
2
C slave transmit
register.
I
2
C Hardware General Call Recognition, I2CALT, Register
Name: I2CALT
Address: 0xFFFF0938
Default value: 0x00
Access: Read and write
Function: This 8-bit MMR is used with hardware general
calls when the I2CSCON Bit 3 is set to 1. This
register is 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.
I
2
C Slave Device ID, I2CIDx, Registers
Name: I2CIDx
Addresses: 0xFFFF093C = I2CID0
0xFFFF0940 = I2CID1
0xFFFF0944 = I2CID2
0xFFFF0948 = I2CID3
Default value: 0x00
Access: Read and write
Function: These 8-bit MMRs are programmed with the
I
2
C bus IDs of the slave. See the I2C Bus
Addresses section for further details.