CHAPTER 4 PORT FUNCTIONS
Preliminary User’s Manual U19014EJ1V0UD
77
(2) Port registers (P0, P1, P3, P6, P12)
These registers write the data that is output from the chip when data is output from a port.
If the data is read in the input mode, the pin level is read. If it is read in the output mode, the value of the output
latch is read.
These registers can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets these registers to 00H.
Figure 4-16. Format of Port Register
7
0
Symbol
P0
6
0
5
0
4
0
3
0
2
0
1
P01
0
P00
Address
FF00H
After reset
00H (output latch)
R/W
R/W
P17
P1
P16
P15
P14
P13
P12
P11
P10
FF01H
00H (output latch)
R/W
0
0
0
0
0
P3
0
0
0
P33
P32
P31
P30
FF03H
00H (output latch)
R/W
P6
0
0
P61
P60
FF06H
00H (output latch)
R/W
0
P12
0
0
0
0
P122
P121
P120
FF0CH
00H (output latch)
R/W
m = 0, 1, 3, 6, 12; n = 0 to 7
Pmn
Output data control (in output mode)
Input data read (in input mode)
0
Output 0
Input low level
1
Output 1
Input high level
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