
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Programmable I/O Port
169
Figure 1.20.8. Pull-up control register
Pull-up control register 0 (Note)
Symbol
PUR0
Address
03FC
16
When reset
00
16
Bit name
Function
Bit symbol
PU00
PU01
PU02
PU03
PU04
PU05
PU06
PU07
Note : In memory expansion and microprocessor mode, the content of this register
can be changed, but the pull-up resistance is not connected.
W
R
A
A
A
b7
b6
b5
b4
b3
b2
b1
b0
P0
0
to P0
3
pull-up
P0
4
to P0
7
pull-up
P1
0
to P1
3
pull-up
P1
4
to P1
7
pull-up
P2
0
to P2
3
pull-up
P2
4
to P2
7
pull-up
P3
0
to P3
3
pull-up
P3
4
to P3
7
pull-up
The corresponding port is pulled
high with a pull-up resistor
0 : Not pulled high
1 : Pulled high
A
A
Pull-up control register 1
Symbol
PUR1
Address
03FD
16
When reset
00
16
(Note 2)
Bit name
Function
Bit symbol
PU10
PU11
PU12
PU13
PU14
PU15
W
R
A
A
b7
b6
b5
b4
b3
b2
b1
b0
P4
0
to P4
3
pull-up (Note 3)
P4
4
to P4
7
pull-up
P5
0
to P5
3
pull-up (Note 3)
P5
4
to P5
7
pull-up
P6
0
to P6
3
pull-up
P6
4
to P6
7
pull-up
PU16
PU17
Note 1: Since P7
0
and P7
1
are N-channel open drain ports, pull-up is not available for them.
Note 2: When the V
CC
level is being impressed to the CNV
SS
terminal, this register becomes
to 02
16
when reset (PU11 becomes to “1”).
Note 3: In memory expansion and microprocessor mode, the content of these bits can be
changed, but the pull-up resistance is not connected.
P7
2
to P7
3
pull-up (Note 1)
P7
4
to P7
7
pull-up
The corresponding port is pulled
high with a pull-up resistor
0 : Not pulled high
1 : Pulled high
A
A
A
Pull-up control register 2
Symbol
PUR2
Address
03FE
16
When reset
00
16
Bit name
Function
Bit symbol
PU20
W
R
A
A
b7
b6
b5
b4
b3
b2
b1
b0
P8
0
to P8
3
pull-up
PU21
P8
4
to P8
7
pull-up
(Except P8
5
)
P9
0
to P9
3
pull-up
PU22
PU23
PU24
PU25
P9
4
to P9
7
pull-up
P10
0
to P10
3
pull-up
P10
4
to P10
7
pull-up
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.
The corresponding port is pulled
high with a pull-up resistor
0 : Not pulled high
1 : Pulled high
A
A
A