mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 298

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Analog-to-Digital Converter
16.3 Functional Description
Technical Data
298
A single conversion sequence consists of four or eight conversions,
depending on the state of the select 8 channel mode (S8CM) bit when
ATDxCTL5 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.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 16-1. Analog-to-Digital Converter Block Diagram
Analog-to-Digital Converter
Go to: www.freescale.com
AND COMPARATOR
RC DAC ARRAY
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
MC68HC912DG128 — Rev 3.0
PORT AD
AND
V
V
V
V
RHx
RLx
DDA
SSA
ANx7/PADx7
ANx6/PADx6
ANx5/PADx5
ANx4/PADx4
ANx3/PADx3
ANx2/PADx2
ANx1/PADx1
ANx0/PADx0
MOTOROLA
REFERENCE
SUPPLY