Holtek HT48R05A-1, Руководство пользователя, Страница: 17 / 125

A.C. Characteristics
Ta=25
°
C
Symbol Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
f
SYS1
System Clock (Crystal OSC)
¾
2.2V~5.5V 400
¾
4000 kHz
¾
3.3V~5.5V 400
¾
8000 kHz
f
SYS2
System Clock (RC OSC)
¾
2.2V~5.5V 400
¾
4000 kHz
¾
3.3V~5.5V 400
¾
8000 kHz
f
TIMER
Timer I/P Frequency (TMR)
¾
2.2V~5.5V 0
¾
4000 kHz
¾
3.3V~5.5V 0
¾
8000 kHz
t
WDTOSC
Watchdog Oscillator Period
3V
¾
45 90 180
m
s
5V
¾
32 65 130
m
s
t
WDT1
Watchdog Time-out Period (RC)
3V
Without WDT prescaler
11 23 46 ms
5V 8 17 33 ms
t
WDT2
Watchdog Time-out Period
(System Clock)
¾
Without WDT prescaler
¾
1024
¾
*t
SYS
t
RES
External Reset Low Pulse Width
¾ ¾
1
¾ ¾ m
s
t
SST
System Start-up Timer Period
¾
Wake-up from HALT
¾
1024
¾
*t
SYS
t
LVR
Low Voltage Width to Reset
¾ ¾
0.25 1 2 ms
t
INT
Interrupt Pulse Width
¾ ¾
1
¾ ¾ m
s
*t
SYS
=1/f
SYS1
or 1/f
SYS2
10
Cost-Effective I/O Type MCU