mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 175

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

9.3.3
In 12-bit operation, ADCRH contains the upper four bits of 12-bit conversion data. In 10-bit operation,
ADCRH contains the upper two bits of 10-bit conversion data. In 12-bit and 10-bit mode, ADCRH is
updated each time a conversion completes except when automatic compare is enabled and the compare
condition is not met. When configured for 10-bit mode, ADR[11:10] are cleared. When configured for
8-bit mode, ADR[11:8] are cleared.
When automatic compare is not enabled, the value stored in ADCRH are the upper bits of the conversion
result. When automatic compare is enabled, the conversion result is manipulated as described in
Section 9.4.5, “Automatic Compare Function”
In 12-bit and 10-bit mode, reading ADCRH prevents the ADC from transferring subsequent conversion
data into the result registers until ADCRL is read. If ADCRL is not read until after the next conversion is
completed, the intermediate conversion data is lost. In 8-bit mode, there is no interlocking with ADCRL.
If the MODE bits are changed, any data in ADCRH becomes invalid.
9.3.4
ADCRL contains the lower eight bits of a 12-bit or 10-bit conversion data, and all eight bits of 8-bit
conversion data. ADCRL is updated each time a conversion completes except when automatic compare is
enabled and the compare condition is not met.
When automatic compare is not enabled, the value stored in ADCRL is the lower eight bits of the
conversion result. When automatic compare is enabled, the conversion result is manipulated as described
in
In 12-bit and 10-bit mode, reading ADCRH prevents the ADC from transferring subsequent conversion
data into the result registers until ADCRL is read. If ADCRL is not read until the after next conversion is
completed, the intermediate conversion data is lost. In 8-bit mode, there is no interlocking with ADCRH.
If the MODE bits are changed, any data in ADCRL becomes invalid.
Freescale Semiconductor
Section 9.4.5, “Automatic Compare Function”
Reset:
Reset:
W
W
R
R
Data Result High Register (ADCRH)
Data Result Low Register (ADCRL)
ADR7
7
0
0
7
0
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
ADR6
0
0
Figure 9-4. Data Result High Register (ADCRH)
0
6
6
Figure 9-5. Data Result Low Register (ADCRL)
ADR5
0
0
0
5
5
prior to storage in ADCRH:ADCRL registers.
ADR4
prior to storage in ADCRH:ADCRL registers.
0
0
0
4
4
ADR11
ADR3
0
0
3
3
Analog-to-Digital Converter (S08ADC12V1)
ADR10
ADR2
0
0
2
2
ADR9
ADR1
0
0
1
1
ADR8
ADR0
0
0
0
0
9-9