Renesas H8S/2318 series, Hardware Manual

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Rev. 5.00, 12/03, page 398 of 1088
10.4 Interrupts
10.4.1 Interrupt Sources and DTC Activation
There are three 8-bit timer interrupt sources: CMIA, CMIB, and OVI. Their relative priorities are
shown in table 10-3. 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 10-3 8-Bit Timer Interrupt Sources
Channel Interrupt Source Description DTC Activation Priority
0 CMIA0 Interrupt by CMFA Possible High
CMIB0 Interrupt by CMFB Possible
OVI0 Interrupt by OVF Not possible
1 CMIA1 Interrupt by CMFA Possible
CMIB1 Interrupt by CMFB Possible
OVI1 Interrupt by OVF Not possible Low
Note: This table shows the initial state immediately after a reset. The relative channel priorities
can be changed by the interrupt controller.
10.4.2 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.