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H8S2245 Datasheet(PDF) 421 Page - Renesas Technology Corp |
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H8S2245 Datasheet(HTML) 421 Page - Renesas Technology Corp |
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421 / 818 page  Section 10 8-Bit Timers Rev.3.00 Mar. 26, 2007 Page 379 of 772 REJ09B0355-0300 Note on Usage If the 16-bit counter mode and compare match counter mode are set simultaneously, the input clock pulses for TCNT0 and TCNT1 are not generated and thus the counters will stop operating. Software should therefore avoid using both these modes. 10.4 Interrupt Sources 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. |
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