HT46C47 Holtek Semiconductor, HT46C47 Datasheet - Page 21

• Manufacturer Part Number: HT46C47
• Description: (HT46C46 / HT46C47) Cost-Effective A/D Type 8-Bit 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~3.3V, such as changing a battery, the LVR will au-
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
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.
No.
1
2
3
4
5
6
7
8
9
*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
*2: Since the low voltage has to maintain in its original state and exceed 1ms, therefore 1ms delay enter the
clock pulses before entering the normal operation.
reset mode.
WDT clock source: WDTOSC or T1 (f
WDT function: enable or disable
CLRWDT instruction(s): one or two clear WDT instruction(s)
System oscillator: RC or crystal
Pull-high resistors (PA, PB, PD): none or pull-high
PWM enable or disable
PA0~PA7 wake-up: enable or disable
PFD enable or disable
Low voltage reset selection: enable or disable LVR function.
LVR
) has to remain in their
Low Voltage Reset
SYS
/4)
HT46R46/HT46C46/HT46R47/HT46C47
21
Options
The relationship between V
Note:
V
operation at 4MHz system clock.
OPR
is the voltage range for proper chip
DD
and V
LVR
December 28, 2004
is shown below.