HT46R52 Holtek Semiconductor, HT46R52 Datasheet - Page 19

• Manufacturer Part Number: HT46R52
• Description: (HT46R51 / HT46R52) A/D Type 8-Bit OTP MCU
• Manufacturer: Holtek Semiconductor

EXIT_INT_ISR:
Low Voltage Reset - LVR
There is a low voltage reset circuit (LVR) implemented in
the microcontrollers. The function can be enabled/dis-
abled by options.
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:
Rev. 1.40
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.
mov
mov
mov
reti
LVR
*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
*2: Since low voltage state has to be maintained in its original state for over 1ms, therefore after 1ms delay,
such as changing a battery, the LVR will au-
clock pulses before entering the normal operation.
a,status_stack
STATUS,a
a,acc_stack
the device enters the reset mode.
LVR
) has to remain in their
; restore STATUS from user defined memory
; restore ACC from user defined memory
Low Voltage Reset
19
The relationship between V
Note: V
operation at 4MHz system clock.
OPR
is the voltage range for proper chip
HT46R51/HT46R52
DD
and V
LVR
is shown below.
July 12, 2005