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CHAPTER 9 16-BIT TIMER COUNTER
138
(2)
Buzzer output control register 90 (BZC90)
This register selects a buzzer frequency selected with the buzzer output control register (BZC90) based on
fcl selected with the count clock select bits (TCL901 and TCL900), and controls the output of a square
wave.
BZC90 is manipulated with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears BZC90 to 00H.
Figure 9-3. Format of Buzzer Output Control Register 90
Notes 1.
Bits 4 to 7 must all be set to 0.
2.
When setting BZOE90 to 1, TOE82 must be set to 0. (See
Figure 10-6
.)
BZOE90
Buzzer Port Output Control
Disables buzzer port output.
Enables buzzer port output.
Note 2
0
1
0
0
0
0
BCS902
BCS901
BCS900
BZOE90
BZC90
Symbol
Address
After Reset
R/W
FF49H
00H
R/W
6
7
5
4
BCS902
BCS901
BCS900
Buzzer Frequency (main system clock: ceramic oscillation)
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
3
2
1
0
fcl = f
X
/2
2
fcl = f
X
/2
6
fcl = f
X
/2
7
fcl = f
XT
fcl/2
4
(78.125 kHz)
fcl/2
5
(39.063 kHz)
fcl/2
8
(4.88 kHz)
fcl/2
9
(2.44 kHz)
fcl/2
10
(1.22 kHz)
fcl/2
11
(610 Hz)
fcl/2
12
(305 Hz)
fcl/2
13
(153 Hz)
fcl/2
4
(4.88 kHz)
fcl/2
5
(2.44 kHz)
fcl/2
8
(305 Hz)
fcl/2
9
(153 Hz)
fcl/2
10
(76 Hz)
fcl/2
11
(38 Hz)
fcl/2
12
(19 Hz)
fcl/2
13
(10 Hz)
fcl/2
4
(2.44 kHz)
fcl/2
5
(1.22 kHz)
fcl/2
8
(153 Hz)
fcl/2
9
(76 Hz)
fcl/2
10
(38 Hz)
fcl/2
11
(19 Hz)
fcl/2
12
(10 Hz)
fcl/2
13
(5 Hz)
fcl/2
4
(2.05 kHz)
fcl/2
5
(1.02 kHz)
fcl/2
8
(128 Hz)
fcl/2
9
(64 Hz)
fcl/2
10
(32 Hz)
fcl/2
11
(16 Hz)
fcl/2
12
(8 Hz)
fcl/2
13
(4 Hz)
BCS902
BCS901
BCS900
Buzzer Frequency (main system clock: RC oscillation)
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
fcl = f
CC
/2
2
fcl = f
CC
/2
6
fcl = f
CC
/2
7
fcl = f
XT
fcl/2
4
(62.5 kHz)
fcl/2
5
(31.3 kHz)
fcl/2
8
(3.91 kHz)
fcl/2
9
(1.95 kHz)
fcl/2
10
(977 Hz)
fcl/2
11
(488 Hz)
fcl/2
12
(244 Hz)
fcl/2
13
(122 Hz)
fcl/2
4
(3.91 kHz)
fcl/2
5
(1.95 kHz)
fcl/2
8
(244 Hz)
fcl/2
9
(122 Hz)
fcl/2
10
(61 Hz)
fcl/2
11
(30.5 Hz)
fcl/2
12
(15.3 Hz)
fcl/2
13
(7.63 Hz)
fcl/2
4
(1.95 kHz)
fcl/2
5
(977 Hz)
fcl/2
8
(122 Hz)
fcl/2
9
(61 Hz)
fcl/2
10
(30.5 Hz)
fcl/2
11
(15.3 Hz)
fcl/2
12
(7.63 Hz)
fcl/2
13
(3.81 Hz)
fcl/2
4
(2.05 kHz)
fcl/2
5
(1.02 kHz)
fcl/2
8
(128 Hz)
fcl/2
9
(64 Hz)
fcl/2
10
(32 Hz)
fcl/2
11
(16 Hz)
fcl/2
12
(8 Hz)
fcl/2
13
(4 Hz)
Note 1