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13.4
Interrupts
13.4.1
Interrupt Sources and DTC Activation
There are three 8-bit timer interrupt sources: CMIA, CMIB, and OVI. Their relative priorities are
shown in Table 13-3. Each interrupt source is set as enabled or disabled by the corresponding
interrupt enable bit in TCR, and independent interrupt requests are sent for each to the interrupt
controller. It is also possible to activate the DTC by means of CMIA and CMIB interrupts.
Table 13-3 8-Bit Timer Interrupt Sources
Channel
Interrupt Source
0
CMIA0
CMIB0
OVI0
1
CMIA1
CMIB1
OVI1
2
CMIA2
CMIB2
OVI2
3
CMIA3
CMIB3
OVI3
Note: This table shows the initial state immediately after a reset. The relative channel priorities
can be changed by the interrupt controller.
13.4.2
A/D Converter Activation
The A/D converter can be activated only by channel 0 compare match A.
If the ADTE bit in TCSR0 is set to 1 when the CMFA flag is set to 1 by the occurrence of channel
0 compare match A, a request to start A/D conversion is sent to the A/D converter. If the 8-bit
timer conversion start trigger has been selected on the A/D converter side at this time, A/D
conversion is started.
538
Description
Interrupt by CMFA
Interrupt by CMFB
Interrupt by OVF
Interrupt by CMFA
Interrupt by CMFB
Interrupt by OVF
Interrupt by CMFA
Interrupt by CMFB
Interrupt by OVF
Interrupt by CMFA
Interrupt by CMFB
Interrupt by OVF
DTC Activation
Possible
Possible
Not possible
Possible
Possible
Not possible
Possible
Possible
Not possible
Possible
Possible
Not possible
Priority
High
Low
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