MC81F4x16
7.9 LVR (Low Voltage Reset) Electrical Characteristics
(T = - 40 C to + 85 C, V
A
= 2.2 V to 5.5 V)
DD
Parameter
Symbol Conditions
Min
2.2
2.5
2.7
3.6
–
Typ
2.4
2.7
3.0
4.0
10
Max
2.6
2.9
3.3
4.4
100
80
Units
LVR voltage
VLVR
–
V
Hysteresis voltage of LVR
Current consumption
△V
–
mV
uA
ILVR
VDD = 3V
–
45
Note :
1. The current of LVR circuit is consumed when LVR is enabled by “ROM Option”.
16
2. 2 /fx ( = 6.55 ms at fx = 10 MHz)
7.10 UART Timing Characteristics
(T = - 40 C to + 85 C, V
A
= 2.2 V to 5.5 V)
DD
Parameter
Symbol
Min
1250
590
–
Typ
Max
1650
–
Units
t
t
t
16
Serial port clock cycle time
SCK
CPU
t
13
Output data setup to clock rising edge
Clock rising edge to input data valid
S1
CPU
t
–
590
S2
nS
Output data hold after clock rising
edge
t
t
– 50
t
CPU
–
H1
CPU
t
Input data hold after clock rising edge
Serial port clock High, Low level width
0
–
–
H2
t
t
t
8
470
970
HIGH, LOW
CPU
tSCK
tHIGH
tLOW
0.8 VDD
0.2 VDD
Figure 7-6 Waveform for UART Timing Characteristics
October 19, 2009 Ver.1.35
36
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