R01UH0092EJ0110 Rev.1.10
Page 247 of 807
Jul 31, 2012
M16C/64C Group
16. DMAC
16.3.5
Single Transfer Mode
In single transfer mode, the transfer stops when the DMAi transfer counter underflows. Figure 16.3
shows an Operation Example in Single Transfer Mode.
Figure 16.3
Operation Example in Single Transfer Mode
DMA
CPU
DMA
CPU
DMA
CPU
CPU
Bus
Undefined
02h
01h
00h
FFh
When a DMA transfer begins, the DMAS bit becomes 0.
Underflow
Set to 0 by an interrupt request acknowledgement
or by a program.
Set to 1 by a program.
Single Transfer Mode
DMAS bit
TCRi register
IR bit
DMAE bit
i = 0 to 3
DMAS, DMAE: Bits in the DMiCON register
IR: Bit in the DMiIC register
The above assumes the following:
The TCRi register value is 02h (there are three transfers).
Reload
Содержание M16C Series
Страница 846: ...M16C 64C Group R01UH0092EJ0110...