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CHAPTER 4 CAUTIONS
User’s Manual U14337EJ1V0UM00
30
Table 4-1. Bus Interface Pin Operation List (2/2)
(b) During run
Internal Memory External Memory
Internal ROM Internal RAM Internal
Peripheral I/O
Emulation RAM Target System
Pin
Name
FRFRWRWFRWFRW
A16 to
A21
Hold the last accessed address Active Active
AD0 to
AD15
Hi-Z Active Active
ASTB H Active Active
R/W H Active Active
DSTB H H Active
LBEN H Active Active
UBEN H Active Active
WAIT Invalid Maskable Maskable
HLDRQ Maskable Maskable Maskable
HLDAK H or L H or L H or L
WRL H H H
Note
WRH H H H
Note
RD H H
Note
H
Note
Active
Remarks 1.
F: Fetch
R: Read
W: Write
2.
H: High-level output
L: Low-level output
Hi-Z: High-impedance