HT46R068B/HT46R069B
Enhanced A/D Type 8-bit OTP MCU
● ACSR Register
Bit
Name
R/W
7
TEST
R
6
ADONB
R/W
1
5
4
VREFS
R/W
0
3
2
ADCSꢃ
R/W
0
1
ADCS1
R/W
0
0
ADCS0
R/W
0
—
—
—
—
—
—
POR
1
Bit 7
TEST: for test mode use only
Bit 6
ADONB: ADC module power on/off control bit
0: ADC module power on
1: ADC module power off
This bit controls the power to the A/D internal function. This bit should be cleared
to zero to enable the A/D converter. If the bit is set high then the A/D converter will
be switched off reducing the device power consumption. As the A/D converter will
consume a limited amount of power, even when not executing a conversion, this
may be an important consideration in power sensitive battery powered applications.
Note: It is recommended to set ADONB=1 before entering the IDLE/SLEEP Mode
for saving power.
Bit 5
unimplemented, read as "0"
Bit 4
VREFS: Select ADC reference voltage
0: VDD
1: VERF pin
This bit is used to select the reference voltage for the A/D converter. If the bit is
high, then the A/D converter reference voltage is supplied on teh external VREF
pin. If the pin is low, then the internal reference is used which is taken from the
pwoer supply pin VDD
.
Bit 3
unimplemented, read as "0"
Bit 2~0
ADCS2~ADCS0: Select A/D converter clock source
000: system clock/2
001: system clock/8
010: system clock/32
011: undefined, can't be used.
100: system clock
101: system clock/4
110: system clock/16
111: undefined, can't be used.
These three bits are used to select the clock source for the A/D converter.
Rev. 1.00
ꢄ4
�anꢀaꢁꢂ ꢃꢄꢅ ꢃ011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
