Datasheet

Chapter 6 Analog-to-Digital Converter (ATD10B16CV4) Block Description
MC9S12E256 Data Sheet, Rev. 1.10
238 Freescale Semiconductor
6.5.1.5 Step 5
Configure starting channel, single/multiple channel, continuous or single sequence and result data format
in ATDCTL5. Writing ATDCTL5 will start the conversion, so make sure your write ATDCTL5 in the last
step.
Example: Leave CD, CC,CB,CA clear to start on channel AN0. Write MULT=1 to convert channel AN0
to AN3 in a sequence (4 conversion per sequence selected in ATDCTL3).
6.5.2 Aborting an A/D conversion
6.5.2.1 Step 1
Write to ATDCTL4. This will abort any ongoing conversion sequence.
(Do not use write to other ATDCTL registers to abort, as this under certain circumstances might not work
correctly.)
6.5.2.2 Step 2
Disable the ATD Interrupt by writing ASCIE=0 in ATDCTL2.
It is important to clear the interrupt enable at this point, prior to step 3, as depending on the device clock
gating it may not always be possible to clear it or the SCF flag once the module is disabled (ADPU=0).
6.5.2.3 Step 3
Clear the SCF flag by writing a 1 in ATDSTAT0.
(Remaining flags will be cleared with the next start of a conversions, but SCF flag should be cleared to
avoid SCF interrupt.)
6.5.2.4 Step 4
Power down ATD by writing ADPU=0 in ATDCTL2.
6.6 Resets
At reset the ATD10B16C is in a power down state. The reset state of each individual bit is listed within
Section 6.3, “Memory Map and Register Definition,” which details the registers and their bit fields.