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7.4.2
Sequential Mode
Sequential mode can be specified by clearing the RPE bit in DMACR to 0. In sequential mode,
MAR is updated after each byte or word transfer in response to a single transfer request, and this is
executed the number of times specified in ETCR. One address is specified by MAR, and the other
by IOAR. The transfer direction can be specified by the DTDIR bit in DMACR. Table 7.3
summarizes register functions in sequential mode.
Table 7.3
Register Functions in Sequential Mode
Function
Register
DTDIR = 0
DTDIR = 1
Initial Setting
Operation
23
0
MAR
Source
address
register
Destination
address
register
Start address of
transfer destination
or transfer source
Incremented/decrem
ented every transfer
23
15
0
IOAR
H'FF
Destination
address
register
Source
address
register
Start address of
transfer source or
transfer destination
Fixed
0
15
ETCR
Transfer counter
Number of transfers Decremented every
transfer, transfer
ends when cunt
reaches H'0000
MAR specifies the start address of the transfer source or transfer destination as 24 bits. MAR is
incremented or decremented by 1 or 2 each time a byte or word is transferred. IOAR specifies the
lower 16 bits of the other address. The 8 bits above IOAR have a value of H'FF. Figure 7.3
illustrates operation in sequential mode.
Содержание H8S/2215 Series
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Страница 721: ...Rev 3 0 10 02 page 663 of 686 ø A23 to A0 to tBRQS tBACD tBZD tBACD tBZD tBRQS Figure 24 11 External Bus Release Timing ...
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