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| 型號： | M38B57M6-166FP |
| 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)： | 54/69頁 |
| 文件大小： | 1011K |
| 代理商： | M38B57M6-166FP |
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MITSUBISHI MICROCOMPUTERS
38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
54
PRELIMINARY
Notice: This s not a final specification.
Some parametric imits are subject to change.
Buzzer Output Circuit
The 38B5 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 P4
3
/B
UZ01
or P2
0
/
B
UZ02
/FLD
0
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. 63 Block Diagram of Buzzer Output Circuit
Fig. 64 Structure of Buzzer Output Control Register
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)
00 : 1 kHz (f(X
IN
)/4096)
01 : 2 kHz (f(X
IN
)/2048)
10 : 4 kHz (f(X
)/1024)
11 : Not available
Output port selection bits
00 : P2
0
and P4
3
function as ordinary ports.
01 : P4
3
/B
UZ01
functions as a buzzer output.
10 : P2
/B
/FLD
0
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
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