HD64F2145 Datasheet, PDF (563/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

• STR3 (TWRE = 1 or SELSTR3 = 0)
R/W
Bit Bit Name Initial Value Slave Host Description
7 IBF3B 0
R
R Bidirectional Data Register Input Buffer Full
Set to 1 when the host processor writes to TWR15.
This is an internal interrupt source to the slave
processor (this LSI). IBF3B is cleared to 0 when the
slave processor reads TWR15.
0: [Clearing condition]
When the slave processor reads TWR15
1: [Setting condition]
When the host processor writes to TWR15 using I/O
write cycle
6 OBF3B 0
R/(W)* R Bidirectional Data Register Output Buffer Full
Set to 1 when the slave processor (this LSI) writes to
TWR15. OBF3B is cleared to 0 when the host
processor reads TWR15.
0: [Clearing condition]
When the host processor reads TWR15 using I/O
read cycle, or the slave processor writes 0 to the
OBF3B bit
1: [Setting condition]
When the slave processor writes to TWR15
5 MWMF 0
R
R Master Write Mode Flag
Set to 1 when the host processor writes to TWR0.
MWMF is cleared to 0 when the slave processor
(this LSI) reads TWR15.
0: [Clearing condition]
When the slave processor reads TWR15
1: [Setting condition]
When the host processor writes to TWR0 using I/O
write cycle while SWMF = 0
Rev. 2.0, 08/02, page 523 of 788