HT48RA0-2 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT48RA0-2 Datasheet PDF : 32 Pages
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HT48RA0-2/HT48CA0-2
D a ta b u s
D
Q
V DD
W eak
P u ll- u p
W r ite
C h ip R e s e t
CK Q
S
R e a d D a ta
S y s te m W a k e -u p
C o d e O p tio n
P B 0 ~ P B 1 o n ly
PA, PB Input/Output Lines
P A 0~P A 7
P B 0~P B 1
R e a d D a ta
D a ta b u s
S y s te m W a k e -u p
C o d e O p tio n
PB Input Lines
V DD
P u ll- u p
P B 2~P B 5
Low Voltage Reset - LVR
The microcontroller provides low voltage reset circuit in
order to monitor the supply voltage of the device. If the
supply voltage of the device is within the range
0.9V~VLVR, such as changing a battery, the LVR will au-
tomatically reset the device internally.
The LVR includes the following specifications:
· The low voltage (0.9V~VLVR) has to remain in their
original state to exceed 1ms. If the low voltage state
does not exceed 1ms, the LVR will ignore it and do not
perform a reset function.
· The LVR uses the ²OR² function with the external
RES signal to perform chip reset.
The relationship between VDD and VLVR is shown below.
V DD
3 .6 V
V LV R
1 .9 V
0 .9 V
Rev. 1.50
10
July 23, 2004
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