SH7144 Datasheet, PDF (748/773 Pages) Renesas Technology Corp – Hitachi SuperH RISC engine

Table B.1 Pin States of Bus Related Signals (2)
Normal external space
16-bit space
Pin Name
8-Bit space
Upper byte
Lower byte
CS0 to CS3
Enabled
Enabled
Enabled
RD
R
L
L
L
WH
H
H
WRHH
R
H
H
H
WH
H
H
WRHL
R
H
H
H
WH
H
H
WRH
R
H
H
H
WH
L
H
WRL
R
H
H
H
WL
H
L
A21 to A0
Address
Address
Address
D31 to D24
High-Z
High-Z
High-Z
D23 to D16
High-Z
High-Z
High-Z
D15 to D8
High-Z
Data
High-Z
D7 to D0
Data
High-Z
Data
Legend:
R: Read
W: Write
Enabled: Chip select signals corresponding to accessed areas=Low
The other chip select signals=High
Word/longword
Enabled
L
H
H
H
H
H
H
L
H
L
Address
High-Z
High-Z
Data
Data
Rev. 2.0, 09/02, page 708 of 732