HT46R71D-1 Holtek Semiconductor, HT46R71D-1 Datasheet - Page 26

• Manufacturer Part Number: HT46R71D-1
• Description: Dual Slope A/D Type MCU
• Manufacturer: Holtek Semiconductor

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The LVR has the same effect or function as the external
RES signal which performs a device reset. When in the
Power Down Mode, both LVR and LVD are disabled.
The microcontroller provides a 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
a battery, the LVR will automatically reset the device in-
ternally.
Note: *1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
Operation Mode
The device has three operational modes. The system clock is sourced only from an external RC oscillator only, and
whose operational modes can be either Normal, IDLE or HALT mode. These are all selected by the software.
Note: The WDTOSC0:1 register should be set to enable, otherwise, the Int.RCOSC will always be disabled. Refer to
Rev. 1.00
Not executed
Instruction
Executed
HALT
*2: Since a low voltage state has to be maintained in its original state for over 1ms, therefore after 1ms delay,
the WDT section for the WDTOSC setup details.
LVR
, such as what might happen when changing
clock pulses before entering the normal operation.
the device enters the reset mode.
IRCC
0
1
x
Disabled
Enabled
WDT
x
Low Voltage Reset
RC Oscillator
Ext.
On
Off
Off
Off
26
The LVR includes the following specifications:
The low voltage, which is specified as 0.9V~V
to remain within this range for a period of time greater
than 1ms. If the low voltage state does not exceed
1ms, the LVR will ignore it will not perform a reset
function.
The LVR has an OR function with the external RES
signal to perform a chip reset.
Disabled and Int.
Disabled and Int.
Enabled and Int.
RCOSC OFF
RCOSC ON
RCOSC ON
IRC Clock
Enabled
System Clock
RC Oscillator
External
Off
Off
Off
HT46R71D-1
May 14, 2007
Normal
Mode
HALT
HALT
Idle
LVR
, has