SN8P2740 Series
ADC, OP-amp, Comparator 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 70
Version 2.0
7.3 I/O PULL UP REGISTER
The I/O pins build in internal pull-up resistors and only support I/O input mode. The port internal pull-up resistor is
programmed by PnUR register. When the bit of PnUR register is
“0”, the I/O pin‟s pull-up is disabled. When the bit of
PnUR register is
“1”, the I/O pin‟s pull-up is enabled.
0E0H
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
P0UR
-
P06R
P05R
-
P03R
P02R
-
P00R
Read/Write
-
W
W
-
W
W
-
W
After reset
-
0
0
-
0
0
-
0
0E1H
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
P1UR
-
P16R
P15R
P14R
P14R
P12R
P11R
P10R
Read/Write
-
W
W
W
W
W
W
W
After reset
-
0
0
0
0
0
0
0
0E4H
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
P4UR
P47R
P46R
P45R
P44R
P43R
P42R
P41R
P40R
Read/Write
W
W
W
W
W
W
W
W
After reset
0
0
0
0
0
0
0
0
Note:P0.4 is input only pin and without pull-up resister. The P0UR.4 is undefined.
Example: I/O Pull up Register
MOV
A, #0FFH
; Enable Port0, 4 Pull-up register,
B0MOV
P0UR, A
;
B0MOV
P4UR,A