MC9RS08KA8RM Datasheet, PDF (101/190 Pages) Freescale Semiconductor, Inc – MC9RS08KA8 Features

Analog-to-Digital Converter (RS08ADC10V1)
10.3.3 Data Result High Register (ADCRH)
ADCRH contains the upper two bits of the result of a 10-bit conversion. When configured for 8-bit
conversions both ADR8 and ADR9 are equal to zero. ADCRH is updated each time a conversion
completes except when automatic compare is enabled and the compare condition is not met. In 10-bit
MODE, reading ADCRH prevents the ADC from transferring subsequent conversion results into the result
registers until ADCRL is read. If ADCRL is not read until after the next conversion is completed, then the
intermediate conversion result will be lost. In 8-bit mode there is no interlocking with ADCRL. In the case
that the MODE bits are changed, any data in ADCRH becomes invalid.
7
6
5
4
3
2
R
0
0
0
0
0
0
W
Reset:
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 10-6. Data Result High Register (ADCRH)
1
ADR9
0
ADR8
0
0
10.3.4 Data Result Low Register (ADCRL)
ADCRL contains the lower eight bits of the result of a 10-bit conversion, and all eight bits of an 8-bit
conversion. This register updates each time a conversion completes except when an automatic compare is
enabled and the compare condition is not met. In 10-bit mode, reading ADCRH prevents the ADC from
transferring subsequent conversion results into the result registers until ADCRL is read. If ADCRL is not
read until after the next conversion completes, then the intermediate conversion results are lost. In 8-bit
mode, there is no interlocking with ADCRH. When MODE bits are changed, data in ADCRL becomes
invalid.
R
W
Reset:
7
ADR7
0
6
ADR6
5
ADR5
4
ADR4
3
ADR3
2
ADR2
0
0
0
0
0
= Unimplemented or Reserved
Figure 10-7. Data Result Low Register (ADCRL)
1
ADR1
0
0
ADR0
0
10.3.5 Compare Value High Register (ADCCVH)
This register holds the upper two bits of the 10-bit compare value. These bits are compared to the upper
two bits of the result following a conversion in 10-bit mode when the compare function is enabled.In 8-bit
operation, ADCCVH is not used during compare.
MC9RS08KA8 Series Reference Manual, Rev. 3
Freescale Semiconductor
101