MC81F4332 Datasheet, PDF (82/198 Pages) Finechips – ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

MC81F4x16
R3CONL – R30~R32
R3 PORT CONTROL LOW REGISTER
00DDH
A reset clears the R3CONL register to „9BH‟, makes the R32-R30 pins to open-drain output mode.
You can use R3CONL register setting to select input or output mode (open-drain or push-pull) and
enable alternative functions.
When programming the port, please remember that any alternative peripheral I/O function that
defined by the R3CONL register must also be enabled in the associated peripheral module.
R3CONL
7
6
5
4
3
2
1
0
R32
R31
R30
Reset value: 9BH
R/W R/W R/W R/W R/W R/W R/W R/W
R32
R32
R31
R31/AN14
R30
R30/AN13
00: Input mode
01: Input pull-up mode
10: Output mode, open-drain
11: Output mode, push-pull
000: Input mode
001: Input pull-up mode
010: Alternative function (AN14)
011: Output mode, open-drain
1xx: Output mode, push-pull
000: Input mode
001: Input pull-up mode
010: Alternative function (AN13)
011: Output mode, open-drain
1xx: Output mode, push-pull
R3
R3 PORT DATA REGISTER
7
6
5
4
3
2
1
0
R3
R37 R36 R35 R34 R33 R32 R31 R30
R/W R/W R/W R/W R/W R/W R/W R/W
In input mode, it represents the R3 port status. 1: High
In output mode, R3 port represents it.
0 : Low
00C3H
Reset value:
--00_0111b
82
October 19, 2009 Ver.1.35