HT48RA0-2/HT48CA0-2
V
D D
D a ta b u s
D
W r ite
C h ip R e s e t
R e a d D a ta
S y s te m
W a k e -u p
Q
C K
S
Q
W e a k
P u ll- u p
P A 0 ~ P A 7
P B 0 ~ P B 1
C o d e O p tio n
P B 0 ~ P B 1 o n ly
PA, PB Input/Output Lines
V
D D
P u ll- u p
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
P B 2 ~ P B 5
PB Input Lines
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~V
LVR
, 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~V
LVR
) has to remain in their
·
The LVR uses the
²OR²
function with the external
RES signal to perform chip reset.
The relationship between V
DD
and V
LVR
is shown below.
V
D D
3 .6 V
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.
V
1 .9 V
L V R
0 .9 V
Rev. 1.50
10
July 23, 2004
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
