CHAPTER 3 CPU FUNCTION
User’s Manual U12688EJ4V0UM00
88
Address
FFFFF04CH
7
0
MM
6
0
5
0
4
0
3
MM3
2
MM2
1
MM1
0
MM0
After reset
Note
Note When in ROM-less mode 0: 07H
When in single-chip mode 0: 00H
When in ROM-less mode 1: 0FH
When in single-chip mode 1: 07H
Bit Position
Bit Name
Function
Memory Expansion Mode
Set the function of ports 4, 5, 6, A, and B.
MM3 MM2 MM1 MM0
Port 4
Port 5
Port A
Port B
Port 6
0
0
0
0
P40 to P47
P50 to P57
PA0 to PA7
PB0 to PB3 PB4, PB6, P60, P62, P64, P66,
0
0
0
1
D0 to D7
D8 to D15
A0 to A7
A8 to A11
PB5 PB7 P61 P63 P65 P67
0
0
1
0
A12,
0
0
1
1
A13 A14,
0
1
0
0
A15 A16,
0
1
0
1
A17 A18,
0
1
1
0
A19 A20,
0
1
1
1
A21 A22,
A23
1
0
0
0
P40 to P47
P50 to P57
PA0 to PA7
PB0 to PB3 PB4, PB6, P60, P62, P64, P66,
1
0
0
1
D0 to D7
A0 to A7
A8 to A11
PB5 PB7 P61 P63 P65 P67
1
0
1
0
A12,
1
0
1
1
A13 A14,
1
1
0
0
A15 A16,
1
1
0
1
A17 A18,
1
1
1
0
A19 A20,
1
1
1
1
A21 A22,
A23
3 to 0
MM3 to
MM0
Caution
Write to the MM register after reset, and then do not change the set value. Also, do not access
an external memory area other than the one for this initialization routine until the initial setting
of the MM register is complete. However, it is possible to access an external memory area
whose initialization is complete.
Remarks 1. For details of the operation of each port’s pins, refer to 2.3 Description of Pin Functions.
2. The function of each port at system reset time is as shown below.
Operation Mode
MM Register
Port 4
Port 5
Port A
Port B
Port 6
ROM-less mode 0
07H
D8 to D15
ROM-less mode 1
0FH
D0 to D7
P50 to P57
A0 to A7
A8 to A15
A16 to A23
Single-chip mode 0
00H
P40 to P47
P50 to P57
PA0 to PA7
PB0 to PB7
P60 to P67
Single-chip mode 1
07H
D0 to D7
D8 to D15
A0 to A7
A8 to A15
A16 to A23
Содержание V850E/MS1 UPD703100
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