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CHAPTER 10 CLOCK OUTPUT/BUZZER OUTPUT CONTROLLER
Preliminary User’s Manual U16035EJ1V0UM
(2) Port mode register (PM7)
This register sets port 7 input/output in 1-bit units.
When using the P74/PCL pin for clock output and the P75/BUZ pin for buzzer output, set PM74, PM75 and the
output latch of P74, P75 to 0.
PM7 is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM7 to FFH.
Figure 10-3. Format of Port Mode Register 7 (PM7)
Address: FF27H After reset: FFH R/W
Symbol
7
6
5
4
3
2
1
0
PM7
1
1
PM75
PM74
PM73
PM72
PM71
PM70
PM7n
P7n pin I/O mode selection (n = 0 to 5)
0
Output mode (output buffer ON)
1
Input mode (output buffer OFF)
