Chapter 10 Analog-to-Digital Converter (ADC12B_LBA_V1)
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
358
Freescale Semiconductor
NOTE
In principle, the MCU could stay in Wait Mode for a shorter period of time
than the ADC needs to abort an ongoing conversion (range of µµµµ
s).
Therefore in case a Sequence Abort Event is issued automatically due to
MCU Wait Mode request a following Restart Event after exit from MCU
Wait Mode can not be executed before ADC has finished this Sequence
Abort Event. The Restart Event is detected but it is pending.
This applies in case MCU Wait Mode is exited before ADC has finished the
Sequence Abort Event and a Restart Event is issued immediately after exit
from MCU Wait Mode. Bit READY can be used by software to detect when
the Restart Event can be issued without latency time in processing the event
(see also
).
Figure 10-1. Conversion Flow Control Diagram - Wait Mode (SWAI=1’b1, AUT_RSTA=1’b0)
•
MCU Freeze Mode
Depending on the ADC Freeze Mode configuration bit FRZ_MOD, the ADC either continues
conversion in Freeze Mode or freezes conversion at next conversion boundary before the MCU
Freeze Mode is entered. After exit from MCU Freeze Mode with previously frozen conversion
sequence the ADC continues the conversion with the next conversion command and all ADC
interrupt flags are unchanged during MCU Freeze Mode.
CSL_0
Active
AN3 AN1 AN4 IN5 AN6 AN1
Wait Mode request (SWAI=1’b1),
Automatic Sequence Abort
Event
Wait Mode
entry
Wake-up
Event
Idle
Active
AN3 AN1 AN4
Abort
Sequence_n
EOS
Sequence_0
AN5 AN2 AN0
Sequence_1
Trigger
Begin from top of current CSL
READY=1’b1
Restart
Event
Earliest point of time to issue
Restart Event without latency
t