tmp89fm43l TOSHIBA Semiconductor CORPORATION, tmp89fm43l Datasheet - Page 421

• Manufacturer Part Number: tmp89fm43l
• Description: 8 Bit Microcontroller Tlcs-870/c1 Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA002
25.5
Note:Care must be taken in system designing since the power-on reset circuit may not fulfill its functions due to the
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-on Reset Circuit Characteristics
Power supply voltage (V
CPU and peripheral circuit
reset signal
V
Symbol
V
t
Warm-up counter clock
t
fluctuations in the power supply voltage (V
t
PROFF
t
PWUP
PROFF
PRON
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
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
PROFF
PRON
DD
)
Figure 25-6 Power-on Reset Operation Timing
Warm-up counter start
t
VDD
Parameter
t
PWUP
Note
Note
DD
).
VDD
Page 407
becomes smaller that t
Min.
1.85
1.70
1.0
−
−
−
−
t
PRON
102 x 2
PWUP
Typ.
2.02
1.85
0.01
0.01
t
−
−
PPW
9
.
/fc
t
PROFF
(V
SS
Max.
2.19
2.00
=0 V, Topr = −40 to 85°C)
0.1
0.1
−
−
5
TMP89FM43L
Unit
ms
ms
V
s