M38B53M4-059FP datasheet(236/355 Pages) MITSUBISHI

236 / 355 page

2-148

38B5 Group User’s Manual

APPLICATION

2.9 Buzzer output circuit

Fig. 2.9.5 Control procedure

2.9.3 Buzzer output circuit application examples

Outline: A buzzer output is performed by using the buzzer output circuit.

Specifications: •f(XIN) = 4.19 MHz, buzzer output frequency = 4 kHz

•Buzzer output from BUZ01 pin

Figure 2.9.3 shows the connection of buzzer output circuit and the setting of the division ratio.

Figure 2.9.4 shows the setting of relevant register. Figure 2.9.5 shows the control procedure.

Fig. 2.9.3 Connection of buzzer output circuit and setting of division ratio

Fig. 2.9.4 Setting of relevant register

f(XIN) = 4.19 MHz

Output port control signal

Port direction register

1/1024

Buzzer output

(4 kHz)

Buzzer output ON/OFF bit

Port latch

Buzzer output control register (address 0EFD16)

BUZCON

Buzzer output: OFF

Output frequency: 4 kHz (f(XIN)/1024)

P43/Buz01: Buzzer output

Initialization

SEI

CLT

CLD

BUZCON (address 0EFD16)

XXX001102

RESET

Buzzer output control register setting

(output frequency = 4 kHz, Buz01 output,

buzzer output OFF)

BUZCON (address 0EFD16), bit 4

Buzzer output ON

CLI

qX: This bit is not used here. Set it to “0” or “1” arbitrarily.

M38B53M4-059FP Datasheet(PDF) 236 Page - Mitsubishi Electric Semiconductor