參數(shù)資料
型號(hào): M38B79MFH-A154FP
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(jī)
文件頁數(shù): 68/109頁
文件大小: 1559K
代理商: M38B79MFH-A154FP
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
68
BUZZER OUTPUT CIRCUIT
The 38B7 group has a buzzer output circuit. One of 1 kHz, 2 kHz
and 4 kHz (at X
IN
= 4.19 MHz) frequencies can be selected by the
buzzer output control register (address 0EFD
16
). Either P7
7
/B
UZ01
or P9
7
/B
UZ02
/AN
15
can be selected as a buzzer output port by the
output port selection bits (b2 and b3 of address 0EFD
16
).
The buzzer output is controlled by the buzzer output ON/OFF bit
(b4).
Fig. 74 Block diagram of buzzer output circuit
Fig. 75 Structure of buzzer output control register
Note:
In the low-speed mode, a buzzer output is made OFF.
f(X
IN
)
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 0EFD
16
)
Output frequency selection bits (X
IN
= 4.19 MHz)
0 0 : 1 kHz (f(X
IN
)/4096)
0 1 : 2 kHz (f(X
IN
)/2048)
1 0 : 4 kHz (f(X
IN
)/1024)
1 1 : Not available
Output port selection bits
0 0 : P7
7
and P9
7
function as ordinary ports.
0 1 : P7
7
/B
UZ01
functions as a buzzer output.
1 0 : P9
7
/B
UZ02
/AN
15
functions as a buzzer output.
1 1 : Not available
Buzzer output ON/OFF bit
0 : Buzzer output OFF (
0
output)
1 : Buzzer output ON
Not used (returns
0
when read)
b7
b0
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