Page 81
TMP89FM42
RA002
7. Voltage Detection Circuit
The voltage detection circuit detects any decrease in the supply voltage and generates voltage detection interrupt
request signals and voltage detection reset signals.
Note: The voltage detection circuit may operate improperly, depending on fluctuations in the supply voltage (VDD). Refer
to the electrical characteristics and take them into consideration when designing equipment.
7.1
Configuration
The voltage detection circuit consists of a reference voltage generation circuit, a detection voltage level selection
circuit, a comparator and control registers.
The supply voltage (VDD) is divided by the ladder resistor and input to the detection voltage selection circuit. A
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.
Either the voltage detection interrupt request signal or the voltage detection reset signal can be selected by pro-
gramming the software.
Figure 7-1 Voltage Detection Circuit
7.2
Control
The voltage detection circuit is controlled by voltage detection control registers 1,2 and 3.
Voltage detection control register 1
VDCR1
(0x0FC6)
7
6
5
4
3
2
1
0
Bit Symbol
VD2F
VD2SF
VD2LVL
VD1F
VD1SF
VD1LVL
Read/Write
R/W
Read Only
R/W
R/W
Read Only
R/W
After reset
0
0
0
0
0
0
0
0
VDD
N
E
1
D
V
D
O
M
1
D
V
N
E
2
D
V
D
O
M
2
D
V
L
V
L
2
D
V
L
V
L
1
D
V
F
S
1
D
V
F
1
D
V
F
S
2
D
V
F
2
D
V
VDCR2
VDCR1
F/F
Voltage detection reset signal 1
Voltage detection reset signal 2
Voltage detection interrupt
request signal
F/F
Voltage detection STOP mode
release signal
1
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Reference voltage
generation circuit
Interrupt request signal
generation circuit
Содержание TLCS-870/C1 Series
Страница 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Страница 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Страница 4: ......
Страница 14: ......
Страница 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Страница 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Страница 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Страница 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Страница 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Страница 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Страница 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Страница 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Страница 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Страница 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Страница 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Страница 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Страница 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Страница 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Страница 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Страница 336: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 Note 1 Make sure that you set the C register to 0x00 LD FLSCR2 0xD5 ...
Страница 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Страница 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Страница 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Страница 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Страница 406: ...26 Package Dimensions TMP89FM42 ...
Страница 408: ......