Справочник Пользователя для Motorola MC68HC908MR16
Advance Information
MC68HC908MR16/MC68HC908MR32 — Rev. 4.0
354
Analog-to-Digital Converter (ADC)
MOTOROLA
Analog-to-Digital Converter (ADC)
In 8-bit mode, this 8-bit result register holds the eight MSBs of the 10-bit
result. This register is updated each time an ADC conversion completes.
In 8-bit mode, this register contains no interlocking with ADRH.
result. This register is updated each time an ADC conversion completes.
In 8-bit mode, this register contains no interlocking with ADRH.
19.8.4 ADC Clock Register
This register selects the clock frequency for the ADC, selecting between
modes of operation.
modes of operation.
ADIV2:ADIV0 — ADC Clock Prescaler Bits
ADIV2, ADIV1, and ADIV0 form a 3-bit field which selects the divide
ratio used by the ADC to generate the internal ADC clock.
ratio used by the ADC to generate the internal ADC clock.
shows the available clock configurations.
Address:
$0042
Bit 7
6
5
4
3
2
1
Bit 0
Read:
AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
Write:
R
R
R
R
R
R
R
R
Reset:
Unaffected by reset
R
= Reserved
Figure 19-8. ADC Data Register Low (ADRL) 8-Bit Mode
Address:
$0043
Bit 7
6
5
4
3
2
1
Bit 0
Read:
ADIV2
ADIV1
ADIV0
ADICLK
MODE1
MODE0
0
0
Write:
R
Reset:
0
1
1
1
0
0
0
0
R
= Reserved
Figure 19-9. ADC Clock Register (ADCLK)