CHAPTER 12 PORT FUNCTIONS
User’s Manual U12688EJ4V0UM00
406
(b) Operation mode of port B
Bit of MM Register
Operation Mode
MM3
MM2
MM1
MM0
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
0
0
0
Port (PB0 to PB7)
0
0
1
PB4
PB5
0
1
0
PB6
PB7
0
1
1
1
0
0
1
0
1
1
1
0
don’t
care
1
1
1
A8
A9
A10
A11
A12
A13
A14
A15
For the details of mode selection by the MODE0 to MODE3 pins, refer to 3.3.2 Operating mode
specification.
In ROM-less modes 0 or 1, or single-chip mode 1, the MM0 to MM3 bits are initialized to 111
×
at system
reset, enabling the external address output mode. If MM0 to MM3 are set to 000
×
by the program, the
port mode can be changed to, but the subsequent external instruction cannot be fetched from data bus.
Also, if MM0 to MM3 are set to 100x or 010x, the subsequent external address output from port B is
disabled.
Remark
×
: don’t care
Содержание V850E/MS1 UPD703100
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