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CHAPTER 13 BUZZER OUTPUT CONTROL CIRCUIT
246
(2) Port mode register 3 (PM3)
This register sets port 3 input/output bit-wise.
When using the P36/BUZ pin for buzzer output function, set PM36 and 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.
Figure 13-3. Port Mode Register 3 Format
Symbol
7
6
5
4
3
2
1
0
Address
When Reset
R/W
PM3
PM37
PM36
PM35
PM34
PM33
PM32
PM31
PM30
FF23H
00H
R/W
PM3n
P3n Pin Input/Output Mode Selection
(n = 0 to 7)
0
Output mode (output buffer ON)
1
Input mode (output buffer OFF)
Содержание 78014Y Series
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