HD6412350 Hitachi, HD6412350 Datasheet - Page 267

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

Whether a block is to be designated for MARA or for MARB is specified by the BLKDIR bit in
DMACRA.
To specify the number of transfers, if M is the size of one block (where M = 1 to 256) and N
transfers are to be performed (where N = 1 to 65,536), M is set in both ETCRAH and ETCRAL,
and N in ETCRB.
Figure 7-13 illustrates operation in block transfer mode when MARB is designated as a block area.
Address T
Address B
Legend
Address
Address
Address
Address
Where :
T
T
B
B
L
L
N
M
A
A
A
B
A
B
A
B
Figure 7-13 Operation in Block Transfer Mode (BLKDIR = 0)
= L
= L
= L
= L
= Value set in MARA
= Value set in MARB
= Value set in ETCRB
= Value set in ETCRAH and ETCRAL
A
B
A
B
+ SAIDE • (–1)
+ DAIDE • (–1)
1st block
2nd block
Nth block
SAID
DAID
• (2
• (2
DTSZ
DTSZ
Consecutive transfer
of M bytes or words
is performed in
response to one
request
• (M•N–1))
• (N–1))
Transfer
Block area
Address T
Address B
B
B
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