參數(shù)資料
型號： M38B42E1H-XXXXFP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機
文件頁數(shù)： 54/78頁
文件大?。?/td> 1214K
代理商： M38B42E1H-XXXXFP
58
38B4 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
BUZZER OUTPUT CIRCUIT
The 38B4 group has a buzzer output circuit. One of 1 kHz, 2 kHz and
4 kHz (at XIN = 4.19 MHz) frequencies can be selected by the buzzer
output control register (address 0EFD16). Either P43/BUZ01 or P20/
BUZ02/FLD0 can be selected as a buzzer output port by the output
port selection bits (b2 and b3 of address 0EFD16).
The buzzer output is controlled by the buzzer output ON/OFF bit
(b4).
Fig. 66 Block diagram of buzzer output circuit
Fig. 67 Structure of buzzer output control register
f(XIN)
1/1024
1/2048
1/4096
Port latch
Buzzer output
Buzzer output ON/OFF bit
Output port control signal
Port direction register
Divider
Buzzer output control register
(BUZCON: address 0EFD16)
Output frequency selection bits (XIN = 4.19 MHz)
00 : 1 kHz (f(XIN)/4096)
01 : 2 kHz (f(XIN)/2048)
10 : 4 kHz (f(XIN)/1024)
11 : Not available
Output port selection bits
00 : P20 and P43 function as ordinary ports.
01 : P43/BUZ01 functions as a buzzer output.
10 : P20/BUZ02/FLD0 functions as a buzzer output.
11 : Not available
Buzzer output ON/OFF bit
0 : Buzzer output OFF (“0” output)
1 : Buzzer output ON
Not used (return “0” when read)
b7
b0
相關(guān)PDF資料
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