SONiX TECHNOLOGY CO. SN8F22711B, User Manual

Page: 67 / 120

SN8F2270B Series
USB 2.0 Low-Speed 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 67
Version 1.3
7
I/O PORT
7.1 I/O PORT MODE
The port direction is programmed by PnM register. All I/O ports can select input or output direction.
0B8H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
P0M
- - - - - P02M P01M P00M
Read/Write - - - - - R/W R/W R/W
After reset - - - - - 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
0C5H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
P5M
- - - - P53M P52M P51M P50M
Read/Write - - - - R/W R/W R/W R/W
After reset - - - - 0 0 0 0
Bit[7:0]
PnM[7:0]:
Pn mode control bits. (n = 0~3).
0 = Pn is input mode.
1 = Pn is output mode.
’ Note:
1. Users can program them by bit control instructions (B0BSET, B0BCLR).
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Example: I/O mode selecting
CLR P0M ; Set all ports to be input mode.
CLR P1M
CLR P5M
MOV A, #0FFH ; Set all ports to be output mode.
B0MOV P0M, A
B0MOV P1M, A
B0MOV P5M, A
B0BCLR P1M.2 ; Set P1.2 to be input mode.
B0BSET P1M.2 ; Set P1.2 to be output mode.