m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 312

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
3.3 Buzzer Output
Overview
Specifications
Operation
Figure 3.3.1. Operation timing of buzzer output
Count start flag
Timer A0
overflow timing
Pulse output
function select bit
P7
0
output
The timer mode is used to make the buzzer ring. Figure 3.3.1 shows the operation timing, and
Figure 3.3.2 shows the set-up procedure.
Use the following peripheral function:
• The pulse-outputting function in timer mode of timer A.
(1) Sound a 2-kHz buzz beep by use of timer A0.
(2) Effect pull-up in the relevant port by use of a pull-up resistor. When the buzzer is off, set the
(3) Connect a 16-MHz oscillator to X
(1) The microcomputer begins performing a count on timer A0. Timer A0 has disabled interrupts.
(2) The microcomputer begins pulse output by setting the pulse output function select bit to
(3) The microcomputer stops outputting pulses by setting the pulse output function select bit to
port high-impedance, and stabilize the potential resulting from pulling up.
“Pulse output effected”. P7
“Pulse output not effected”. P7
high-impedance.
“1”
“0”
“1”
“0”
“1”
“0”
page 303 of 354
(1) Start count
High-impedance
0
changes into TA0
0
goes to an input pin, and the output from the pin becomes
IN
.
(2) Buzzer output ON
OUT
pin and outputs 2-kHz pulses.
(3) Buzzer output OFF
3. Timer A Applications
High-impedance