Figure 8-8 Operation in Normal Mode
Transfers can be requested (activated) by an external request or auto-request. An auto-requested
transfer is activated by the register settings alone. The designated number of transfers are executed
automatically. Either cycle-steal or burst mode can be selected. In cycle-steal mode the DMAC
releases the bus temporarily after each transfer. In burst mode the DMAC keeps the bus until the
transfers are completed, unless there is a bus request from a higher-priority bus master.
For the detailed settings see section 8.3.4, Data Transfer Control Registers (DTCR).
Address T
Address B
Transfer
Legend
L
L
N
T
B
T
B
SAID
DAID
Address T
Address B
A
B
A
A
B
B
= initial setting of MARA
= initial setting of MARB
= initial setting of ETCRA
= L
= L + SAIDE • (–1) • (2 • N – 1)
= L
= L + DAIDE • (–1) • (2 • N – 1)
A
A
B
B
DTSZ
DTSZ
A
A
B
B
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