HT46RU22 Holtek Semiconductor Inc., HT46RU22 Datasheet - Page 20

• Manufacturer Part Number: HT46RU22
• Description: Ht46ru22 -- A/d Type 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

Rev. 1.20
Bit No.
Bit No.
PCR2
2~6
0
1
7
0
1
2
3
4
5
6
7
0
0
0
0
1
1
1
1
ACS2
0
0
0
0
1
1
1
1
ADCS0
ADCS1
START Starts the A/D conversion. (0 1 0= start; 0 1= Reset A/D converter and set EOCB to 1 )
EOCB
Label
Label
ACS0
ACS1
ACS2
PCR0
PCR1
PCR2
TEST
PCR1
0
0
1
1
0
0
1
1
Selects the A/D converter clock source
00= system clock/2
01= system clock/8
10= system clock/32
11= undefined
Unused bit, read as 0
For test mode used only
Defines the analog channel select.
Defines the port B configuration select. If PCR0, PCR1 and PCR2 are all 0, the ADC circuit is
power 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 initialized by issuing a START signal, other-
wise the EOCB flag may have an undefined condition. See Important note for A/D initialization .
PCR0
0
1
0
1
0
1
0
1
ACS1
0
0
1
1
0
0
1
1
AN7
PB7
PB7
PB7
PB7
PB7
PB7
PB7
7
Analog Input Channel Selection
PB6
PB6
PB6
PB6
PB6
PB6
PB6
AN6
ACSR (27H) Register
ADCR (26H) Register
Port B Configuration
6
ACS0
0
1
0
1
0
1
0
1
20
PB5
PB5
PB5
PB5
PB5
PB5
AN5
AN5
5
Function
Function
PB4
PB4
PB4
PB4
PB4
AN4
AN4
AN4
4
AN3
AN3
AN3
AN3
PB3
PB3
PB3
PB3
3
Analog Channel
PB2
PB2
PB2
AN2
AN2
AN2
AN2
AN2
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
2
PB1
PB1
AN1
AN1
AN1
AN1
AN1
AN1
HT46RU22
1
March 23, 2007
PB0
AN0
AN0
AN0
AN0
AN0
AN0
AN0
0