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M38B57MC Fiches technique(PDF) 54 Page - Mitsubishi Electric Semiconductor |
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M38B57MC Fiches technique(HTML) 54 Page - Mitsubishi Electric Semiconductor |
54 / 69 page MITSUBISHI MICROCOMPUTERS 38B5 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 54 PRELIMINAR Y Notice: This is not a final specification. Some parametric limits 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 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. 63 Block Diagram of Buzzer Output Circuit Fig. 64 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 |
Numéro de pièce similaire - M38B57MC |
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Description similaire - M38B57MC |
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