SONIX SN8P2308, User Manual

Page: 72 / 119

SN8P2318 Series
C-type LCD, RFC 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 72
Version 1.5
7.2 I/O PORT MODE
The port direction is programmed by PnM register. When the bit of PnM register is
“0”, the pin is input mode. When the
bit of PnM register is
“1”, the pin is output mode.
0B8H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
P0M - - - P04M - P02M P01M P00M
Read/Write - - - R/W - R/W R/W R/W
After reset - - - 0 - 0 0 0
0C1H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
P1M - P16M P15M P14M P13M P12M P11M P10M
Read/Write - R/W R/W R/W R/W R/W R/W R/W
After reset - 0 0 0 0 0 0 0
0C2H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
P2M P27M P26M P25M P24M P23M P22M P21M P20M
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
After reset 0 0 0 0 0 0 0 0
0C3H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
P3M P37M P36M P35M P34M P33M P32M P31M P30M
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
After reset 0 0 0 0 0 0 0 0
0C5H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
P5M - - - P54M - - - -
Read/Write - - - R/W - - - -
After reset - - - 0 - - - -
Bit[7:0]
PnM[7:0]: Pn mode control bits. (n = 0~5).
0 = Pn is input mode.
1 = Pn is output mode.

Note:
1. Users can program them by bit control instructions (B0BSET, B0BCLR).
2. P0.3 input only pin, and the P0M.3 is undefined.

Example: I/O mode selection.
CLR P0M ; Set all ports to be input mode.
CLR P1M
MOV A, #0FFH ; Set all ports to be output mode.
B0MOV P0M, A
B0MOV P1M,A
B0BCLR P1M.0 ; Set P1.0 to be input mode.
B0BSET P1M.0 ; Set P1.0 to be output mode.