AN2688 Freescale Semiconductor / Motorola, AN2688 Datasheet - Page 12

• Manufacturer Part Number: AN2688
• Description: Implementing a 10-Bit Sigma-Delta Analog-to-Digital Converter Using the HC9S08Rx MCU Family Analog Comparator
• Manufacturer: Freescale Semiconductor / Motorola

AN2688/D
Software Description
12
Two software options are listed in this application note. The first one is intended to
implement a first-order continuous-time Σ∆ modulator according to the flowchart in
Figure
time Σ∆ AD converter in
Implementing a 10-Bit Sigma-Delta Analog-to-Digital Converter
Using the HC9S08Rx MCU Family Analog Comparator
Freescale Semiconductor, Inc.
12. The second one corresponds to the complete first-order continuous-
Figure 12. The First-Order Σ∆ Modulator Software Flowchart
For More Information On This Product,
Go to: www.freescale.com
Figure 5
PTA1 AND PTA2 = 1
CONFIGURATION
CONFIGURATION
SET PTA2, PTA2,
INITIALIZATION
ACMP > V
REGISTERS
REGISTERS
WAIT MODE
AS OUTPUT
INTERRUPT
AND PTE0
OCCURS
PTE0 = 0
PTE0 = 1
START
TIMER
and its flowchart is depicted in
Y
REF
?
N
PTA1 AND PTA2 = 0
Figure
MOTOROLA
13.