Datasheet
CHAPTER 6 16-BIT TIMER/EVENT COUNTERS 00
User’s Manual U18698EJ1V0UD
157
(6) Port mode register 3 (PM3)
This register sets port 3 input/output in 1-bit units.
When using the P34/TI52/TI010/TO00/RTC1HZ/INTP1 pin for timer output, set PM34 and the output latches of
P34 to 0.
When using the P33/TI000/RTCDIV/RTCCL/BUZ/INTP2 and P34/TI52/TI010/TO00/RTC1HZ/INTP1 pins for timer
input, set PM33 and PM34 to 1. At this time, the output latches of P33 and P34 may be 0 or 1.
PM3 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets PM3 to FFH.
Figure 6-11. Format of Port Mode Register 3 (PM3)
7
1
6
1
5
1
4
PM34
3
PM33
2
PM32
1
PM31
0
1
Symbol
PM3
Address: FF23H After reset: FFH R/W
PM3n
0
1
P3n pin I/O mode selection (n = 1 to 4)
Output mode (output buffer on)
Input mode (output buffer off)