GMS81508A Datasheet, PDF (40/91 Pages) Hynix Semiconductor – USERS MANUAL

GMS81508/16
2.11. BUZZER DRIVER
Buzzer driver consist of 6 bit binary counter, Buzzer Register(BUR), and selector of clock. The wide
range frequency(500Hz~250KHz) can be generated using programmable counter. PORT R55 is
assigned for output port of Buzzer Driver by setting bit5 of PMR5($00D1H) to "1".
WtBUR
PS4
PS5
PS6
MUX
PS7
Internal Data Bus
BUCK1 BUCK0 BU5 BU4 BU3 BU2 BU1 BU0
6
0
1
2
3
4
5
6bit Counter
TQ
Buzzer
Output

PORT R5 MODE REGISTER
PMR5
<00D1_H>
W
W
7
6
5
4
3
2
1
0
-
- BUZ WDTO -
-
-
-
R55 / BUZ Selection
0 : R55 ( Input / Output )
1 : BUZ ( Output )

BUZZER DATA REGISTER
BUR
<00EC_H>
W
W
W
W
W
W
W
W
7
6
5
4
3
2
1
0
BUCK1 BUCK0 BU5 BU4 BU3 BU2 BU1 BU0
Buzzer Source Clock
Selection
00 : PS4
01 : PS5
10 : PS6
11 : PS7
Buzzer Count Data
35