HT45R36 Holtek Semiconductor, HT45R36 Datasheet - Page 20

• Manufacturer Part Number: HT45R36
• Description: C/R to F Type 8-Bit OTP MCU
• Manufacturer: Holtek Semiconductor

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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
will automatically reset the device internally.
The LVR includes the following specifications:
Note:
Options
The following table shows all kinds of options in the microcontroller. All of the options must be defined to ensure proper
system functioning.
Rev. 1.00
No.
The low voltage (0.9V~V
nal state for longer than t
does not exceed t
perform a reset function.
The LVR uses an OR function with the external RES
signal to perform a chip reset.
10
11
12
1
2
3
4
5
6
7
8
9
Wake-up PA0~PA7 (bit option)
Pull-high PA0~PA7 (port option)
Pull-high PB0~PB7 (port option)
Pull-high PC0~PC7 (port option)
Pull-high PD0 (bit option)
WDT clock source
WDT
CLRWDT
LVR
OSC: X tal mode or RC mode
INT0 trigger edge
INT1 trigger edge
LVR
*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
*2: Since low voltage has to be maintained its original state for longer than t
, such as when changing a battery, the LVR
clock pulses before starting the normal operation.
the reset mode.
LVR
, the LVR will ignore it and will not
Function
LVR
LVR
) has to remain in its origi-
. If the low voltage state
Low Voltage Reset
None wake-up or wake-up
None pull-high or pull-high
None pull-high or pull-high
None pull-high or pull-high
None pull-high or pull-high
WDTOSC or f
Enable or disable
1 or 2 instruction
Disable or enable
X tal mode or RC mode
Disable, rising edge, falling edge or double edge
Disable, rising edge, falling edge or double edge
20
The relationship between V
Note:
SYS
V
tion at 4MHz system clock.
OPR
/4
is the voltage range for proper chip opera-
Description
LVR
, therefore a t
DD
and V
September 28, 2006
LVR
LVR
is shown below.
delay enters
HT45R36