NEC 78K0 User Manual page 168
8-bit single-chip microcontrollers
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(3) Port mode registers 1 and 3 (PM1, PM3)
These registers set port 1 and 3 input/output in 1-bit units.
When using the P17/TO50/TI50 and P33/TO51/TI51/INTP4 pins for timer output, set PM17 and PM33 and the
output latches of P17 and P33 to 0.
When using the P17/TO50/TI50 and P33/TO51/TI51/INTP4 pins for timer input, set PM17 and PM33 to 1. The
output latches of P17 and P33 at this time may be 0 or 1.
PM1 and PM3 can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets these registers to FFH.
Address: FF21H
After reset: FFH
Symbol
7
PM1
PM17
PM1n
0
Output mode (output buffer on)
1
Input mode (output buffer off)
Address: FF23H
After reset: FFH
Symbol
7
PM3
0
PM3n
0
Output mode (output buffer on)
1
Input mode (output buffer off)
168
CHAPTER 7 8-BIT TIMER/EVENT COUNTERS 50 AND 51
Figure 7-9. Format of Port Mode Register 1 (PM1)
R/W
6
5
4
PM16
PM15
PM14
P1n pin I/O mode selection (n = 0 to 7)
Figure 7-10. Format of Port Mode Register 3 (PM3)
R/W
6
5
4
0
0
0
P3n pin I/O mode selection (n = 0 to 3)
User's Manual U16227EJ2V0UD
3
2
1
PM13
PM12
PM11
3
2
1
PM33
PM32
PM31
0
PM10
0
PM30
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