MC912DG128A Motorola, MC912DG128A Datasheet - Page 312

• Manufacturer Part Number: MC912DG128A
• Description: Microcontrollers
• Manufacturer: Motorola

Functional Description
Analog-To-Digital Converter (ATD)
MC68HC912DT128A Rev 2.0
312
Figure 58 Analog-to-Digital Converter Block Diagram
A single conversion sequence consists of four or eight conversions,
depending on the state of the select 8 channel mode (S8CM) bit when
ATDCTL5 is written. There are eight basic conversion modes. In the
non-scan modes, the SCF bit is set after the sequence of four or eight
conversions has been performed and the ATD module halts. In the scan
modes, the SCF bit is set after the first sequence of four or eight
conversions has been performed, and the ATD module continues to
restart the sequence. In both modes, the CCF bit associated with each
register is set when that register is loaded with the appropriate
conversion result. That flag is cleared automatically when that result
register is read. The conversions are started by writing to the control
registers.
AND COMPARATOR
RC DAC ARRAY
Analog-To-Digital Converter (ATD)
ATD 0
ATD 1
ATD 2
ATD 3
ATD 4
ATD 5
ATD 6
ATD 7
SAR
INTERNAL BUS
SELECT/PRESCALE
SAMPLE BUFFER AMP
DATA INPUT REGISTER
CLOCK
ANALOG MUX
PORT AD
AND
V
V
V
V
RHx
RLx
DDA
SSA
HC12 ATD BLOCK
ANx7/PADx7
ANx6/PADx6
ANx5/PADx5
ANx4/PADx4
ANx3/PADx3
ANx2/PADx2
ANx1/PADx1
ANx0/PADx0
REFERENCE
SUPPLY
MOTOROLA
2--atd