tmp89ch42 TOSHIBA Semiconductor CORPORATION, tmp89ch42 Datasheet - Page 93

• Manufacturer Part Number: tmp89ch42
• Description: 8 Bit Microcontroller Tlcs-870/c1 Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA000
6. Power-on Reset Circuit
6.1
6.2
the detection voltage of the power-on reset circuit, a power-on reset signal is generated.
generation circuit by the comparator.
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.
power-on reset circuit, a power-on reset signal is generated.
circuits is released after the warm-up time that follows reset release has elapsed.
voltage until the end of the warm-up time that follows reset release. If the supply voltage has not reached the operating
range by the end of the warm-up time that follows reset release, the TMP89CH42 cannot operate properly.
Configuration
Function
The power-on reset circuit generates a reset when the power is turned on. When the supply voltage is lower than
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
When power supply voltage goes on, if the supply voltage is equal to or lower than the releasing voltage of the
When power supply voltage goes down, if the supply voltage is equal to or lower than the detecting voltage of the
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
Increase the supply voltage into the operating range during the period from detection of the power-on reset release
VDD
Reference voltage
generation circuit
Figure 6-1 Power-on Reset Circuit
Comparator
Page 79
Power-on reset signal
TMP89CH42