HT46R068B/HT46R069B
Enhanced A/D Type 8-bit OTP MCU
● CTRL2 Register
Bit
Name
R/W
7
DACEN
R/W
0
6
5
4
3
2
1
0
LXTEN
R/W
1
—
—
—
PWMC3 PWMCꢃ
R/W
0
—
—
—
—
—
—
—
—
—
R/W
0
POR
Bit 7
DACEN: DAC disable/enable control
0: disable
1: enable
Bit 6
unimplemented, read as "0"
Bit 5
PWMC3: IO or PWM3 control
Described elsewhere
Bit 4
PWMC2: IO or PWM2 control
Described elsewhere
Bit 3~1
unimplemented, read as "0"
Bit 0
LXTEN: LXT Oscillator on/off control after execution of HALT instruction
Described elsewhere
● VOL Register
Bit
7
6
VOL1
R/W
0
5
VOL0
R/W
0
4
—
R/W
0
3
—
—
0
2
—
—
0
1
—
—
0
0
—
—
0
Name
R/W
POR
VOLꢃ
R/W
0
Bits 7~5
VOL2~VOL0 Audio Volume Control
Unimplemented – read as “0”
Bits 4~0
Low Voltage Detector - LVD
Each device has a Low Voltage Detector function, also known as LVD. This enables the device to
monitor the power supply voltage, VDD, and provide a warning signal should it fall below a certain
level. This function may be especially useful in battery applications where the supply voltage will
gradually reduce as the battery ages, as it allows an early warning battery low signal to be gener-
ated.
LVD Register
The Low Voltage Detector is controlled using a single register, LVDC, and configuration options.
The voltage threshold level to be detected is determined using a configuration option, therefore
cannot be modified by the application program.
A low voltage condition is indicated when the LVDO bit is set. If the LVDO bit is low, this indi-
cates that the VDD voltage is above the preset low voltage value. The LVDEN bit is used to control
the overall on/off function of the low voltage detector. Setting the bit high will enable the low volt-
age detector. Clearing the bit to zero will switch off the internal low voltage detector circuits. As
the low voltage detector will consume a certain amount of power, it may be desirable to switch off
the circuit when not in use, an important consideration in power sensitive battery powered applica-
tions.
Rev. 1.00
103
�anꢀaꢁꢂ ꢃꢄꢅ ꢃ011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
