197
Chapter 7
DMA Functions (DMA Controller)
Preliminary User’s Manual U15839EE1V0UM00
Figure 7-29, “DMA Transfer Forcible Termination Example 2,” on page 197 shows a forcible termination
of a block transfer operation of DMA channel 1. A transfer containing a new configuration is executed.
Figure 7-29:
DMA Transfer Forcible Termination Example 2
Remarks: 1. Since the DSALn, DSAHn, DDALn, DDAHn and DBCn registers are buffered registers,
the next transfer condition can be set even during a DMA transfer. However, a setting in
the DADCn register is ignored (refer to 7.3 Next Address Setting Function)
2. n = 0 to 3
7.12 DMA
Transfer
Completion
7.12.1 DMA transfer end interrupt
When DMA transfer ends and the TCn bit of the DCHCn register is set, a DMA transfer end interrupt
(INTDMAn) is issued to the interrupt controller (INTC).
Remark:
n = 0 to 3
7.12.2 Terminal count output upon DMA transfer end
The terminal count signal becomes active for one clock during the last DMA transfer cycle.
DMA Transfer
Request CH1
DSAL1, DSAH1,
DDAL1, DDAH1
DCHC1
(INIT1 bit = 1)
→
→
→
DMA1
CPU
CPU
CPU
CPU DMA1
CPU
CPU
CPU
CPU
DMA1
DMA1
DMA1
DMA1 DMA1
DMA1 DMA1
DMA channel 1
terminal count
DMA channel 1 transfer is forcibly
terminated and the bus is released
EN1 bit = 1
TC1 bit = 0
EN1 bit
0
TC1 bit
1
Set register
CPU
Set register
Set register
Set register
EN1 bit
0
TC1 bit = 0
EN1 bit
1
TC1 bit = 0
DSAL1, DSAH1,
DDAL1, DDAH1
DADC1,
DCHC1
→
Summary of Contents for mPD703128
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