tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 95

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

RA002
7. Voltage Detection Circuit
7.1 Configuration
7.2 Control
VDD
Voltage detection control register 1
(0x0FC6)
VDCR1
request signals and voltage detection reset signals.
circuit, a comparator and control registers.
voltage is selected in the detection voltage selection circuit, depending on the detection voltage (VDxLVL), and
compared to the reference voltage in the comparator. When the supply voltage (VDD) becomes lower than the detec-
tion voltage (VDxLVL), a voltage detection interrupt request signal or a voltage detection reset signal is generated.
gramming the software.
The voltage detection circuit detects any decrease in the supply voltage and generates voltage detection interrupt
Note: The voltage detection circuit may operate improperly, depending on fluctuations in the supply voltage (VDD). Refer
The voltage detection circuit consists of a reference voltage generation circuit, a detection voltage level selection
The supply voltage (VDD) is divided by the ladder resistor and input to the detection voltage selection circuit. A
Either the voltage detection interrupt request signal or the voltage detection reset signal can be selected by pro-
The voltage detection circuit is controlled by voltage detection control registers 1,2 and 3.
to the electrical characteristics and take them into consideration when designing equipment.
Read/Write
Bit Symbol
After reset
VDCR1
Reference voltage
generation circuit
VD2F
R/W
7
0
Figure 7-1 Voltage Detection Circuit
Read Only
VD2SF
VDCR2
6
0
5
0
Page 81
VD2LVL
R/W
4
0
F/F
F/F
VD1F
R/W
3
0
Interrupt request signal
Read Only
VD1SF
generation circuit
2
0
1
0
Voltage detection reset signal 1
Voltage detection interrupt
request signal
Voltage detection STOP mode
release signal
Voltage detection reset signal 2
VD1LVL
R/W
TMP89FM42
0
0