HT46R221 Holtek Semiconductor Inc, HT46R221 Datasheet - Page 19

• Manufacturer Part Number: HT46R221
• Description: 8-Bit A/D Type MCU
• Manufacturer: Holtek Semiconductor Inc

When the A/D conversion is completed, the A/D inter-
rupt request flag is set. The EOC bit is set to 1 when
the START bit is set from 0 to 1 .
Note: *: D0~D8 is A/D conversion result data bit
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:
Rev. 1.10
Register Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
ADRL
ADRH
The low voltage (0.9V~3.3V) has to remain in their
original state to exceed 1ms. If the low voltage state
LSB~MSB.
*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,
clock pulses before entering the normal operation.
the device enters the reset mode.
D0
D8
D7
D6
D5
D4
D3
D2
Low voltage reset
D1
19
The relationship between V
Note:
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.
V
tion at 4MHz system clock.
OPR
is the voltage range for proper chip opera-
HT46R22/HT46C22
DD
and V
LVR
October 2, 2002
is shown below.