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CHAPTER 6 PORT FUNCTIONS
150
(3) Memory expansion mode register (MM)
The registers are used to set port 4 input/output.
MM is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets MM to 10H.
Figure 6-18. Memory Expansion Mode Register Format
Symbol
7
6
5
4
3
2
1
0
Address
When Reset
R/W
MM
0
0
PW1
PW0
0
MM2
MM1
MM0
FFF8H
10H
R/W
MM2
MM1
MM0
Single-chip/Memory
P40 to P47, P50 to P57, P64 to P67 Pins Condition
Expansion Mode Selection
P40 to P47
P50 to P53
P54, P55
P56, P57
P64 to P67
0
0
0
Single-chip mode
Port Input
Port mode
0
0
1
mode Output
0
1
1
Memory
256 bytes
AD0 to
Port mode
P64 = RD
expansion
mode
AD7
P65 = WR
1
0
0
mode
4 Kbytes
A8 to A11
Port mode
P66 = WAIT
mode
P67 = ASTB
1
0
1
16 Kbytes
A12, A13
Port mode
mode
1
1
1
Full-address
A14, A15
mode
Note
Other than above
Setting prohibited
PW1
PW0
Wait Control
0
0
No wait
0
1
With wait (1-wait state insertion)
1
0
Setting prohibited
1
1
Wait control with an external wait pin
Note
Full-address mode is the mode that can execute external expansion to all the areas other than internal ROM,
RAM, SFR areas and the reserved areas in 64 K address space.
Remarks 1. P60 to P63 pins enter the port mode regardless of the single-chip mode or memory expansion mode.
2. Besides it is used to set port 4 input/output, MM has functions to set the number of waits and external
expansion area.
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