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(2) Port mode register 3 (PM3)
This register sets port 3 input/output in 1-bit units.
When using the P36/BUZ pin for buzzer output, set PM36 and the output latch of P36 to 0.
PM3 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM3 to FFH.
Symbol
7
6
5
PM3
PM37 PM36 PM35 PM34 PM33 PM32 PM31 PM30
CHAPTER 11 BUZZER OUTPUT CONTROLLER
Figure 11-3. Format of Port Mode Register 3
4
3
2
1
User's Manual U11302EJ4V0UM
0
Address
After reset
FF23H
FFH
PM3n
P3n pin I/O mode selection (n = 0 to 7)
0
Output mode (output buffer on)
1
Input mode (output buffer off)
R/W
R/W
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