CHAPTER 4 CAUTIONS
29
4.5
NMI Signal Mask Function
When using the P00/NMI pin in the port mode, do not mask the NMI signal.
4.6
Bus Interface Pin
The operation of the pin for the bus interface differs between the emulator and the target device as follows.
Table 4-1. Bus Interface Pin Operation List (1/2)
(a) During break
Internal memory
External memory
Memory used by
emulator
Internal
ROM
Internal RAM
Internal
Peripheral I/O
Emulation RAM
Target System
Pin name
F
R
W
R
R
W
R
W
R
W
R
W
A16-A21
Hold the accessed last
Active
Active
AD0-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
