tmp88f846ug TOSHIBA Semiconductor CORPORATION, tmp88f846ug Datasheet - Page 237

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

21.6 Power On Reset circuit (POR)
Supply operating voltage
CPU/peripheral circuits
reset signal
Power-on reset signal
Note: The power-on reset circuit may not operate properly depending on transitions in supply voltage (VDD). When
V
Note 1: The total error includes all errors except a quanitization error, and is defined as a maximum deviation from the
Note 2: The input clock to the warm-up counter is derived from the oscillation circuit. Because the oscillation frequency is
Note 3: The supply voltage must be raised to satisfy the condition t
Symbol
V
t
t
t
PROFF
t
PROFF
PRON
PWUP
t
PRON
PRW
VDD
Warm-up
counter clock
designing your application system, careful consideration must be given to ensure proper operation of the power-on
reset circuit by referring to the device's electrical characteristics.
ideal conversion line.
unstable until the oscillation circuit stabilizes, the warm-up time includes error.
V
V
PROFF
PRON
Power-on reset release voltage
Power-on reset threshold voltage
Power-on reset release response time
Power-on reset generation response time
Power-on reset minimum pulse width
Warming-up time after releasing RESET
Power supply raising time
V
DD
Figure 21-2 Operation of the Power-on reset circuit
t
VDD
Warm-up counter start
t
Parameter
PWUP
Page 227
14.0
Min
2.2
2.0
1.0
VDD
–
–
–
< t
t
PWUP
PRON
.
0.01
0.01
Typ
2.4
2.2
–
–
–
t
PRW
(V
t
PROFF
SS
Max
30.0
2.6
2.3
0.1
0.1
–
7
= 0 V, Topr = −40 to 85°C)
TMP88F846UG
Unit
ms
V