HD64F2168 Datasheet, PDF (570/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

R/W
Bit Bit Name Initial Value Slave Host Description
1 IBF1
0
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 16.7.
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
0 OBF1 0
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
Note: * Only 0 can be written to clear the flag.
Rev. 3.00, 03/04, page 530 of 830