118
(2) Determination of Priority: The DTC activation source is selected in accordance with the
default priority order, and is not affected by mask or priority levels. See 8.6 Interrupts and 9.3.3
DTC Vector Table for the respective priority.
(3) Operation Order: If the same interrupt is selected as a DTC activation source and a CPU
interrupt source, the DTC data transfer is performed first, followed by CPU interrupt exception
handling.
If the same interrupt is selected as the DMAC activation factor and as the DTC activation factor or
CPU interrupt factor, these operate independently. They operate in accordance with the respective
operating states and bus priorities.
Table 5-11 shows the interrupt factor clear control and selection of interrupt factors by
specification of the DTA bit of DMAC's DMABCR, DTC's DTCERA to DTCERF, DTCERI's
DTCE bits, and the DISEL bit of DTC's MRB.
Table 5-11 Interrupt Source Selection and Clearing Control
Settings
DMAC
DTC
Interrupt Source Selection/Clearing Control
DTA
DTCE
DISEL
DMAC
DTC
CPU
0
0
*
X
∆
1
0
∆
X
1
∆
1
*
*
∆
X
X
Legend
∆
: The relevant interrupt is used. Interrupt source clearing is performed.
(The CPU should clear the source flag in the interrupt handling routine.)
: The relevant interrupt is used. The interrupt source is not cleared.
X : The relevant bit cannot be used.
*
: Don’t care
(4) Notes on Use: SCI and A/D converter interrupt sources are cleared when the DMAC or DTC
reads or writes to the prescribed register, and are not dependent upon the DTA, DTCE, and DISEL
bits.
Содержание H8S/2631
Страница 28: ...xviii Appendix G Package Dimensions 1154 ...
Страница 341: ...316 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 9 8 Memory Mapping in Block Transfer Mode ...
Страница 918: ...905 ø DREQ0 DREQ1 tDRQS tDRQH Figure 25 19 DMAC DREQ Input Timing ...
Страница 955: ...943 A 2 Instruction Codes Table A 2 shows the instruction codes ...