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(4) Port mode register 3 (PM3)
This register sets port 3 input/output bit-wise.
When using the P31/TO1 and P32/TO2 pins for timer output, set output latches PM31, PM32, and P31, P32 to
0.
PM3 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM3 to FFH.
Symbol
PM3
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CHAPTER 9 8-BIT TIMER/EVENT COUNTER
Figure 9-7. Port Mode Register 3 Format
7
6
5
4
PM37
PM36
PM35
PM34
3
2
1
0
PM33
PM32
PM31
PM30
Address
When Reset
R/W
FF23H
FFH
R/W
PM3n
P3n Pin Input/Output Mode Selection
(n = 0 to 7)
0
Output mode (output buffer ON)
1
Input mode (output buffer OFF)
211
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