211
8.1.4
Pin Configuration
Table 8-2 summarizes the DMAC pins.
In short address mode, external request transfer, single address transfer, and transfer end output
are not performed for channel A.
The DMA transfer acknowledge function is used in channel B single address mode in short
address mode.
When the
DREQ
pin is used, do not designate the corresponding port for output.
With regard to the
DACK
pins, setting single address transfer automatically sets the corresponding
port to output, functioning as a
DACK
pin.
With regard to the
TEND
pins, whether or not the corresponding port is used as a
TEND
pin can
be specified by means of a register setting.
Table 8-2
DMAC Pins
Channel
Pin Name
Symbol
I/O
Function
0
DMA request 0
DREQ0
Input
DMAC channel 0 external
request
DMA transfer acknowledge 0
DACK0
Output
DMAC channel 0 single address
transfer acknowledge
DMA transfer end 0
TEND0
Output
DMAC channel 0 transfer end
1
DMA request 1
DREQ1
Input
DMAC channel 1 external
request
DMA transfer acknowledge 1
DACK1
Output
DMAC channel 1 single address
transfer acknowledge
DMA transfer end 1
TEND1
Output
DMAC channel 1 transfer end
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 ...