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M38B71M1 Datasheet(PDF) 69 Page - Renesas Technology Corp

Part No. M38B71M1
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M38B71M1 Datasheet(HTML) 69 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
68
BUZZER OUTPUT CIRCUIT
The 38B7 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 P77/BUZ01
or P97/BUZ02/AN15 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. 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(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)
b1b0
0 0 : 1 kHz (f(XIN)/4096)
0 1 : 2 kHz (f(XIN)/2048)
1 0 : 4 kHz (f(XIN)/1024)
1 1 : Not available
Output port selection bits
b3b2
0 0 : P77 and P97 function as ordinary ports.
0 1 : P77/BUZ01 functions as a buzzer output.
1 0 : P97/BUZ02/AN15 functions as a buzzer output.
1 1 : Not available
Buzzer output ON/OFF bit
b4
0 : Buzzer output OFF (“0” output)
1 : Buzzer output ON
Not used (returns “0” when read)
b7
b0


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