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Section 19 LPC Interface (LPC)
Bit
Bit Name Initial Value Slave Host Description
1
IBF1
0
0
OBF1
0
Note:
* Only 0 can be written to clear the flag.
Rev. 1.00 Mar. 12, 2008 Page 692 of 1178
REJ09B0403-0100
R/W
R
R
Input Data Register Full
Indicates whether or not there is receive data in
IDR1. This bit is an internal interrupt source to the
slave processor (this LSI).
The IBF1 flag setting and clearing conditions are
different when the fast A20 gate is used. For details
see table 19.7.
0: There is not receive data in IDR1
[Clearing condition]
When the slave processor reads IDR
1: There is receive data in IDR1
[Setting condition]
When the host processor writes to IDR using I/O
write cycle
R/(W)* R
Output Data Register Full
Indicates whether or not there is transmit data in
ODR1.
0: There is not transmit data in ODR1
[Clearing condition]
When the host processor reads ODR1 using I/O
read cycle, or the slave processor writes 0 to the
OBF1 bit
1: There is transmit data in ODR1
[Setting condition]
When the slave processor writes to ODR1
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