Page 79
TMP89FM42
RA000
6. Power-on Reset Circuit
The power-on reset circuit generates a reset when the power is turned on. When the supply voltage is lower than
the detection voltage of the power-on reset circuit, a power-on reset signal is generated.
6.1
Configuration
The power-on reset circuit consists of a reference voltage generation circuit and a comparator.
The supply voltage divided by ladder resistor is compared with the voltage generated by the reference voltage gen-
eration circuit by the comparator.
Figure 6-1 Power-on Reset Circuit
6.2
Function
When power supply voltage goes on, if the supply voltage is equal to or lower than the releasing voltage of the
power-on reset circuit, a power-on reset signal is generated and if it is higher than the releasing voltage of the power-
on reset circuit, a power-on reset signal is released.
When power supply voltage goes down, if the supply voltage is equal to or lower than the detecting voltage of the
power-on reset circuit, a power-on reset signal is generated.
Until the power-on reset signal is generated, a warm-up circuit and a CPU is reset.
When the power-on reset signal is released, the warm-up circuit is activated. The reset of the CPU and peripheral
circuits is released after the warm-up time that follows reset release has elapsed.
Increase the supply voltage into the operating range during the period from detection of the power-on reset release
voltage until the end of the warm-up time that follows reset release. If the supply voltage has not reached the operat-
ing range by the end of the warm-up time that follows reset release, the TMP89FM42 cannot operate properly.
VDD
Power-on reset signal
Comparator
Reference voltage
generation circuit
Summary of Contents for TLCS-870/C1 Series
Page 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 ...
Page 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Page 4: ......
Page 14: ......
Page 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Page 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Page 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Page 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Page 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Page 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Page 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Page 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Page 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Page 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Page 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Page 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Page 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Page 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Page 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Page 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Page 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Page 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Page 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Page 406: ...26 Package Dimensions TMP89FM42 ...
Page 408: ......