HT46R64/HT46C64
Bit No. Label
Function
0
1
2
ACS0
ACS1 Defines the analog channel select.
ACS2
3
4
5
PCR0
Defines the port B configuration select. If PCR0, PCR1 and PCR2 are all zero, the ADC circuit is
power off to reduce power consumption
PCR1
PCR2
Indicates end of A/D conversion. (0 = end of A/D conversion)
Each time bits 3~5 change state the A/D should be initialized by issuing a START signal, other-
wise the EOCB flag may have an undefined condition. See ²Important note for A/D initialization².
6
7
EOCB
START Starts the A/D conversion. (0®1®0= start; 0®1= Reset A/D converter and set EOCB to ²1²)
ADCR (26H) Register
PCR2
PCR1
PCR0
7
6
5
4
3
2
1
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
PB7
PB7
PB7
PB7
PB7
PB7
PB7
AN7
PB6
PB6
PB6
PB6
PB6
PB6
PB6
AN6
PB5
PB5
PB5
PB5
PB5
PB5
AN5
AN5
PB4
PB4
PB4
PB4
PB4
AN4
AN4
AN4
PB3
PB3
PB3
PB3
AN3
AN3
AN3
AN3
PB2
PB2
PB2
AN2
AN2
AN2
AN2
AN2
PB1
PB1
AN1
AN1
AN1
AN1
AN1
AN1
PB0
AN0
AN0
AN0
AN0
AN0
AN0
AN0
Port B Configuration
ACS2
ACS1
ACS0
Analog Channel
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
1
0
1
0
1
0
1
Analog Input Channel Selection
Register
ADRL
Bit7
D1
Bit6
Bit5
¾
Bit4
¾
Bit3
¾
Bit2
¾
Bit1
¾
Bit0
¾
D0
D8
ADRH
D9
D7
D6
D5
D4
D3
D2
Note: D0~D9 is A/D conversion result data bit LSB~MSB.
ADRL (24H), ADRH (25H) Register
Rev. 1.80
23
February 14, 2006
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
