M38B53M4-059FP datasheet(235/355 Pages) MITSUBISHI

235 / 355 page

38B5 Group User’s Manual

APPLICATION

2-147

2.9 Buzzer output circuit

Fig. 2.9.2 Structure of buzzer output control register

2.9 Buzzer output circuit

The output frequency can be selected from 1 kHz, 2 kHz, or 4 kHz (at f(XIN) = 4.19 MHz), and the output

port can be selected between either the BUZ01 pin or the BUZ02 pin.

This paragraph describes the setting method of buzzer output circuit relevant register, notes etc.

2.9.1 Memory assignment

Fig. 2.9.1 Memory assignment of buzzer output circuit relevant register

2.9.2 Relevant register

The buzzer output circuit starts outputting a buzzer by setting the buzzer output ON/OFF bit (bit 4) of the

buzzer output control register.

Figure 2.9.2 shows the structure of the buzzer output control register.

Buzzer output control register (BUZCON)

0EFD16

Address

Buzzer output control register

b7 b6 b5 b4 b3 b2 b1 b0

Buzzer output control register

(BUZCON: address 0EFD16)

Name

Functions

At reset R W

0: Buzzer output OFF (“0”

output)

1: Buzzer output ON

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 frequency

selection bits

b3b2

0 0: P20 and P43 function

as ordinary ports.

0 1: P43/BUZ01 functions as

a buzzer output.

1 0: P20/BUZ02/FLD0

functions as a buzzer

output.

1 1: Not available

Output port

selection bits

Buzzer output

ON/OFF bit

Nothing is arranged for these bits. These are

write disabled bits. When these bits are read

out, the contents are “0”.

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