HT46R52 Holtek Semiconductor, HT46R52 Datasheet - Page 17

• Manufacturer Part Number: HT46R52
• Description: (HT46R51 / HT46R52) A/D Type 8-Bit OTP MCU
• Manufacturer: Holtek Semiconductor

Rev. 1.40
Bit No. Label
0
1
2
3
4
5
6
7
PCR2
0
0
0
0
1
1
1
1
START
EOCB
ACS0
ACS1
ACS2
PCR0
PCR1
PCR2
ADCR (22H) Register
Defines the analog channel select
Defines the port B configuration se-
lect. If PCR0, PCR1 and PCR2 are all
zero, the ADC circuit is powered off to
reduce power consumption
Indicates end of A/D conversion.
(0= end of A/D conversion)
Each time bits 3~5 change state the
A/D should be initialised by issuing a
START signal, otherwise the EOCB
flag may have an undefined condition.
See Important note for A/D initialis-
ation .
Starts the A/D conversion.
0 1 0= Start
0 1= Reset A/D converter and set
EOCB to 1 .
PCR1
0
0
1
1
0
0
1
1
Function
PCR0
0
1
0
1
0
1
0
1
A/D Conversion Timing
Port B Configuration
AN4
PB4
PB4
PB4
PB4
PB4
4
17
Note: * undefined, cannot be used
Note:
ADRH (21H) D11 D10 D9 D8 D7 D6 D5 D4
Register
ADRL (20H) D3 D2 D1 D0
AN3
AN3
PB3
PB3
PB3
PB3
ACS2
3
0
0
0
0
1
1
1
1
Undefined, cannot be used
D0~D11 is A/D conversion result data bit
LSB~MSB.
Analog Input Channel Selection
ACS1
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0
0
1
1
0
0
1
1
PB2
PB2
PB2
AN2
AN2
AN2
2
ACS0
0
1
0
1
0
1
0
1
HT46R51/HT46R52
PB1
PB1
AN1
AN1
AN1
AN1
1
Analog Channel
0
AN0
AN1
AN2
AN3
AN4
0
July 12, 2005
*
*
*
PB0
AN0
AN0
AN0
AN0
AN0
0
0
0