tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 397

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA002
25.5 Power-on Reset Circuit Characteristics
Note: Care must be taken in system designing since the power-on reset circuit may not fulfill its functions due to the fluc-
Note 1: Because the power-on reset releasing voltage and the power-on reset detecting voltage change relative to one another,
Note 2: A clock output by an oscillating circuit is used as the input clock for a warming-up counter. Because the oscillation fre-
Note 3: Boost the power supply voltage such that t
Power supply voltage (V
CPU and peripheral circuit
reset signal
Symbol
V
V
t
Warm-up counter clock
tuations in the power supply voltage (V
t
t
PROFF
PROFF
PRON
t
PWUP
t
Power-on reset signal
PRON
PRW
VDD
the detected voltage will never become inverted.
quency does not stabilize until an oscillating circuit stabilizes, some errors may be included in the warming-up time.
Operating voltage
V
Power-on reset releasing voltage
Power-on reset detecting voltage
Power-on reset releasing response time
Power-on reset detecting response time
Power-on reset minimum pulse width
Warming-up time after a reset is cleared
Power supply rise time
V
PROFF
PRON
DD
Figure 25-6 Power-on Reset Operation Timing
)
Warm-up counter start
t
Parameter
VDD
t
PWUP
DD
).
Note
Note
VDD
Page 383
becomes smaller that t
Min.
1.85
1.75
1.0




t
PRON
102 x 2
PWUP
2.02
1.85
0.01
0.01
Typ.


t
.
PPW
9
/fc
(V
t
PROFF
SS
Max.
2.19
1.95
0.1
0.1


5
0 V, Topr
40 to 85qC)
Unit
ms
ms
V
s
TMP89FM42