
Technical Data
MC68HC11E Family
—
Rev. 4
220
Analog-to-Digital (A/D) Converter
MOTOROLA
Analog-to-Digital (A/D) Converter
10.11 A/D Converter Result Registers
These read-only registers hold an 8-bit conversion result. Writes to these
registers have no effect. Data in the A/D converter result registers is valid
when the CCF flag in the ADCTL register is set, indicating a conversion
sequence is complete. If conversion results are needed sooner, refer to
Figure 10-3
, which shows the A/D conversion sequence diagram.
Register name: Analog-to-Digital Converter Result Register 1
Bit 7
6
Address: $1031
3
5
4
2
1
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
Indeterminate after reset
Register name: Analog-to-Digital Converter Result Register 2
Address: $1032
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
Indeterminate after reset
Register name: Analog-to-Digital Converter Result Register 3
Address: $1033
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
Indeterminate after reset
Register name: Analog-to-Digital Converter Result Register 4
Address: $1034
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
Indeterminate after reset
= Unimplemented
Figure 10-6. Analog-to-Digital Converter
Result Registers (ADR1
–
ADR4)