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The DTC transfer mode can be normal mode, repeat mode, or block transfer mode.
The 24-bit SAR designates the DTC transfer source address and the 24-bit DAR designates the
transfer destination address. After each transfer, SAR and DAR are independently incremented,
decremented, or left fixed.
Table 9-2 outlines the functions of the DTC.
Table 9-2
DTC Functions
Transfer Mode
•
Normal mode
One transfer request transfers one
byte or one word
Memory addresses are incremented
or decremented by 1 or 2
Up to 65,536 transfers possible
•
Repeat mode
One transfer request transfers one
byte or one word
Memory addresses are incremented
or decremented by 1 or 2
After the specified number of
transfers (1 to 256), the initial state
resumes and operation continues
•
Block transfer mode
One transfer request transfers a block
of the specified size
Block size is from 1 to 256 bytes or
words
Up to 65,536 transfers possible
A block area can be designated at
either the source or destination
340
Activation Source
•
IRQ
•
TPU TGI
•
8-bit timer CMI
•
SCI TXI or RXI
•
A/D converter ADI
•
DMAC DEND
•
Software
Address Registers
Transfer
Transfer
Source
Destination
24 bits
24 bits
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