HT46RU25 Holtek Semiconductor Inc., HT46RU25 Datasheet - Page 27

• Manufacturer Part Number: HT46RU25
• Description: Ht46ru25/ht46cu25 -- A/d Type 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

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 has the
same effect or function with the external RES signal
which performs a chip reset. During HALT state, LVR is
disabled.
The LVR includes the following specifications:
Note:
Rev. 1.30
The low voltage (0.9V~V
original state for more than 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 a chip reset.
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 a 1ms delay,
, such as changing a battery, the LVR will au-
clock pulses before entering the normal operation.
the device enters the reset mode.
LVR
) has to remain in their
A/D Conversion Timing
Low Voltage Reset
27
The relationship between V
Note: V
operation at 4MHz system clock.
OPR
is the voltage range for proper chip
HT46RU25/HT46CU25
DD
and V
LVR
is shown below.
March 9, 2007