tmp88f846ug TOSHIBA Semiconductor CORPORATION, tmp88f846ug Datasheet - Page 59

• Manufacturer Part Number: tmp88f846ug
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

6. Power-on reset circuit
6.1 Power-on reset circuit
6.1.1 Configuration
6.1.2 function
reset signal if the supply voltage drops below the threshold voltage of the power-on reset circuit.
The power-on reset circuit generates a reset when the TMP88F846UG is powered on. It also generates a power-on
ated by the reference voltage generator.
the supply voltage is below the power-on reset release voltage. The power-on reset signal is released when the
supply voltage rises above the power-on reset release voltage.
supply voltage drops below the power-on reset threshold voltage.
reset.
time has elapsed, the CPU and peripheral circuits are released from the reset state.
mended operating range before the power-on warm-up time expires. If the supply voltage is not in the recom-
mended operating range at the completion of the power-on warm-up time, the TMP88F846UG cannot operate
properly.
The power-on reset circuit is comprised of a reference voltage generator and a comparator.
The comparator compares the supply voltage divided by a resistor ladder with the reference voltage gener-
When the TMP88F846UG is powered on, the power-on reset circuit generates a power-on reset signal while
When the TMP88F846UG is shut off, the power-on reset circuit generates a power-on reset signal when the
While the power-on reset signal is generated, the warm-up counter circuit, CPU and peripheral circuits are
Upon release of the power-on reset signal, the warm-up counter circuit starts operating. After the warm-up
After the supply voltage reaches the power-on reset release voltage level, it must be raised to the recom-
VDD
Reference detection voltage
Figure 6-1 Power-on reset circuit
Comparator
+
−
Page 49
Power On Reset signal
TMP88F846UG