tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 147

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA001
11. Divider Output (
11.1 Configuration
11.2 Control
Divider output control register
11.2.1 Function
(0x0038)
DVOCR
device.
This function outputs approximately 50% duty pulses that can be used to drive the piezoelectric buzzer or other
The divider output is controlled by the divider output control register (DVOCR).
Note 1: fcgck: Gear clock [Hz], fs: Low-frequency clock [Hz]
Note 2: DVOCR<DVOEN> is cleared to "0" when the operation is switched to STOP or IDLE0/SLEEP0 mode. DVOCR<DVOCK>
Note 3: When SYSCR1<DV9CK> is "1" in the NORMAL 1/2 or IDLE 1/2 mode, the DVO frequency is subject to some fluctuations
Note 4: Bits 7 to 3 of DVOCR are read as "0".
Select the divider output frequency at DVOCR<DVOCK>.
holds the value.
to synchronize fs and fcgck.
DVOEN
DVOCK
Read/Write
Bit Symbol
After reset
Enables/disables
the divider output
Selects the divider output frequency
Unit: [Hz]
R
7
0
-
fcgck/2
fcgck/2
fcgck/2
DVO
12
11
10
fcgck/2
or fs/2
or fs/2
or fs/2
Figure 11-1 Divider Output
R
6
0
-
)
5
4
3
9
DVOCK
Selector
A
B
C
D
2
R
5
0
0: Disable the divider output
1: Enable the divider output
S
-
Page 133
00
01
10
11
Y
DVOCR
DV9CK=0
fcgck/2
fcgck/2
fcgck/2
fcgck/2
R
4
0
DVOEN
-
NORMAL 1/2, IDLE 1/2 mode
12
11
10
9
R
3
0
-
DVO pin
DV9CK=1
Reserved
DV0EN
fs/2
fs/2
fs/2
R/W
2
0
5
4
3
1
0
DVOCK
SLOW1/2
Reserved
R/W
SLEEP1
TMP89FM42
mode
fs/2
fs/2
fs/2
5
4
3
0
0