HT45R06 Holtek Semiconductor, HT45R06 Datasheet - Page 19

• Manufacturer Part Number: HT45R06
• Description: A/D Type 8-Bit OTP MCU
• Manufacturer: Holtek Semiconductor

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:
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
The low voltage (0.9V~V
tained for more than 1ms, and the other circuits re-
main in their original state. 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 a chip reset.
No.
1
2
3
4
5
6
7
8
LVR
*1: To make sure that the system oscillator has stabilized, the CSST provides an extra delay of
*2: Since low voltage has to be maintained for more than 1ms, otherwise the system remain in their original
, such as changing a battery, the LVR will au-
WDT clock source: WDTOSC or f
WDT function: enable or disable
LVR function: enable or disable
CLRWDT instruction (s):
One or two clear WDT instruction (s)
System oscillator: RC or crystal
Pull-high resistors (PA, PB and PD): none or pull-high
PFD function: enable or disable
PA0~PA7 wake-up: enable or disable
2.5ms before entering the normal operation.
state. Therefore a 1ms delay has to elapse before entering the reset mode.
LVR
) state has to be main-
SYS
/4
Low Voltage Reset
19
Options
The relationship between V
Note:
V
tion at 2MHz system clock.
OPR
is the voltage range for proper chip opera-
DD
and V
LVR
is shown below.
HT45R06
May 24, 2005