CHAPTER 12 PORT FUNCTIONS
User’s Manual U12688EJ4V0UM00
404
(b) Operation mode of port A
Bit of MM Register
Operation Mode
MM3
MM2
MM1
MM0
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
0
0
0
Port (PA0 to PA7)
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
don’t
care
1
1
1
Address bus (A0 to A7)
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.
Remark
×
: don’t care
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