NEC uPD78P078 User Manual
Page 235
235
CHAPTER 9 8-BIT TIMER/EVENT COUNTERS 1 AND 2
(4) Port mode register 3 (PM3)
This register sets port 3 input/output in 1-bit units.
When using the P31/TO1 and P32/TO2 pins for timer output, set PM31, PM32, and output latches of P31
and P32 to 0.
PM3 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM3 to FFH.
Figure 9-7. Port Mode Register 3 Format
0
1
2
3
4
5
6
7
Symbol
PM30
FF23H
FFH
R/W
Address
After Reset
R/W
PM31
PM32
PM33
PM34
PM35
PM36
PM37
PM3
PM3n P3n Pin Input/Output Mode Selection (n = 0 to 7)
0
Output mode (output buffer ON)
1
Input mode (output buffer OFF)