7641_06 Datasheet, PDF (157/385 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

7641 Group
APPLICATION
2.2 Timer
RESET
Initialization
SEI
CCR (address 1F16), bit7
CPMA (address 0016)
P4
(address 1816), bit3
P4D (address 1916), bit3
TMX (address 2716)
TXL (address 2016)
TXH (address 2116)
ICONB (address 0616), bit4
1
00001XXX2
1
1
100100002
3F16
0016
0
CLI
q X: This bit is not used here. Set it to “0” or “1” arbitrarily.
•All interrupts disabled
•φ = f(XIN)/2
•Port P43/CNTR0 state setting at buzzer output stopped;
“H” level output
•Timer X interrupt disabled
•CNTR0 output stopped; Buzzer output stopped
•Interrupts enabled
Main processing
Output unit
Piezoelectric buzzer request ?
•Processing buzzer request, generated during main
processing, in output unit
Yes
No
TXM
TXL
TXH
(address 2716), bit7
(address 2016)
(address 2116)
1
3F16
0016
Stop of piezoelectric buzzer
output
TXM (address 2716), bit7
0
Start of piezoelectric buzzer output
Fig. 2.2.18 Control procedure
Rev.2.00 Aug 28, 2006 page 26 of 148
REJ09B0336-0200