Z51F3220FNX Datasheet, PDF (75/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
9.8 P5 Port
9.8.1 P5 Port Description
P5 is 6-bit I/O port. P5 control registers consist of P5 data register (P5), P5 direction register (P5IO) and P5
pull-up resistor selection register (P5PU) . Refer to the port function selection registers for the P5 function
selection.
9.8.2 Register description for P5
P5 (P5 Data Register) : B0H
7
6
5
4
3
2
1
0
–
–
P55
P54
P53
P52
P51
P50
–
–
R/W
R/W
R/W
R/W
R/W
R/W
Initial value : 00H
P5[5:0]
I/O Data
P5IO (P5 Direction Register) : D1H
7
6
5
–
–
P55IO
–
–
R/W
P5IO[5:0]
4
P54IO
R/W
3
P53IO
R/W
2
P52IO
R/W
1
P51IO
R/W
0
P50IO
R/W
Initial value : 00H
P5 Data I/O Direction
0
Input
1
Output
NOTE: EC0/EINT8/EINT10/BLNK function possible when input
P5PU (P5 Pull-up Resistor Selection Register) : 95H
7
6
5
4
–
–
P55PU
P54PU
–
–
R/W
R/W
3
P53PU
R/W
2
P52PU
R/W
P5PU[5:0]
Configure Pull-up Resistor of P5 Port
0
Disable
1
Enable
1
P51PU
R/W
0
P50PU
R/W
Initial value : 00H
PS029902-0212
PRELIMINARY
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