HT48R70A-1_07 HOLTEK [Holtek Semiconductor Inc], HT48R70A-1_07 Datasheet - Page 17

• Manufacturer Part Number: HT48R70A-1_07
• Description: I/O Type 8-Bit MCU
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

The I/O functions of PB0/PB1 are shown below.
Note:
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
tomatically reset the device internally.
The LVR includes the following specifications:
Note: *1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of
Rev. 2.10
PB0 I/O
PB1 I/O
PB0 Mode
PB1 Mode
PB0 Data
PB1 Data
PB0 Pad Status
PB1 Pad Status
The low voltage (0.9V~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.
The LVR uses the OR function with the external
RES signal to perform chip reset.
LVR
*2: Since low voltage has to be maintained in its original state and exceed 1ms, therefore 1ms
I input, O output, D, D
B buzzer option, BZ or BZ, x don't care
C CMOS output
, such as changing a battery, the LVR will au-
1024 system clock pulses before entering the normal operation.
delay enters the reset mode.
x
x
x
x
I
I
I
I
LVR
) has to remain in their
O
C
D
D
x
x
I
I
0
, D
1
data,
O
C
D
D
x
x
I
I
Low Voltage Reset
O
B
x
0
x
0
I
I
17
The relationship between V
Note: V
O
B
B
x
1
x
I
I
tion at 4MHz system clock.
OPR
D
D
D
D
O
O
C
C
0
1
0
1
is the voltage range for proper chip opera-
HT48R70A-1/HT48C70-1
O
O
B
C
D
D
0
0
DD
O
O
and V
B
C
D
B
D
1
LVR
is shown below.
O
O
B
B
0
x
0
0
August 7, 2007
O
O
B
B
B
B
1
x