CHAPTER 4 CAUTIONS
32
Table 4-2. Bus Interface Pin Operation List (2/3)
(b) During user program execution
Internal Memory
External Memory
Internal ROM
Internal RAM
Internal
Peripheral I/O
Emulation RAM
Target System
Pin Name
F
R
F
R
W
R
W
F
R
W
F
R
W
A0 to A23
Note
Note
Note
D0 to D15
Hi-Z
Note
Note
WE
H
H
Note
OE
H
H
Note
RD
H
H
Note
ADV/
BCYST
H
Note
Note
UWR/
UCAS
H
H
Note
LWR/
LCAS
H
H
Note
IROD
H
H
Note
IOWR
H
H
Note
CS0 to CS7
H
H
Note
RAS0 to
RAS7
H
H
Note
REFRQ
H
H
Note
WAIT
Note
Maskable
HLDRQ
Maskable
Maskable
HLDAK
Note
Note
Note
Performs the same operation as the cycle that is generated by the target device program execution.
Remarks 1.
F
: Fetch
R
: Read
W
: Write
2.
H
: High-level output
Hi-Z : High-impedance
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