m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 96

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

2. APPLICATION
Fig. 2.2.17 Setting of related registers [Piezoelectric buzzer output]
Fig. 2.2.18 Control procedure [Piezoelectric buzzer output]
82
During stopping outputting a piezoelectric buzzer (P4
Control procedure :
Figure 2.2.18 shows a control procedure.
Output unit
P4
P4D
ICON2
T34M
T3
Initialization
T34M
T3
T34M (Address:29
(Address:08
(Address:09
(Address:3F
(Address:29
(Address:22
A piezoelectric buzzer
is requested?
Timer 34 mode register (Address:29
Timer 3 (Address:22
Main processing
1
RESET
16
16
16
16
16
N
), bit7
), bit7
)
)
), bit7, bit0
16
63
), bit6
01000000
0
16
3819 Group USER’S MANUAL
1
1
64 – 1
0
)
0
0
2
7
)
Y
During outputting a piezoelectric buzzer (T3
Timer 3 count : Operating
Timer 3 count source : f(X
Timer 3 output selection :
outputting a piezoelectric buzzer ).
The piezoelectric buzzer request occured in the
main processing is processed in the output unit.
Set the port condition during stopping outputting
a piezoelectric buzzer ( “H” level output ).
Timer 3 interrupts : Disabled
The T3
Set "division ratio – 1"
Set to “1” during outputting a piezoelectric buzzer.
Set to “0” during stopping outputting of a piezoelectric
buzzer.
T34M (Address:29
16
)
OUT
output is stopped at this point (stop
16
), bit6
IN
)/16
MITSUBISHI MICROCOMPUTER
1
3819 Group
OUT
)
2.2 Timer