CHAPTER 4 CAUTIONS
User’s Manual U14700EJ2V0UM
36
Table 4-2. Bus Control Pin Operation List (2/2)
(b) During user program execution
Internal Memory
External Memory
Internal ROM
Internal RAM
On-Chip
Peripheral I/O
Emulation RAM
Target System
Pin Name
F
R
F
R
W
R
W
F
R
W
F
R
W
AD0 to AD15
Hi-Z
Note
Note
A16 to A23
Address accessed last is held
Note
Note
CS0 to CS7
H
H
Note
RD
H
H
Note
ASTB
H
Note
Note
LWR, UWR
H
H
Note
WAIT
Invalid
Maskable
Maskable
HLDRQ
Maskable
Maskable
Maskable
HLDAK
Note
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