HD6432670 Hitachi, HD6432670 Datasheet - Page 344

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Transfer requests (activation sources) are external requests and auto-requests. With auto-request,
the DMAC is only activated by register setting, and the specified number of transfers are
performed automatically. With auto-request, cycle steal mode or burst mode can be selected. In
cycle steal mode, the bus is released to another bus master each time a transfer is performed. In
burst mode, the bus is held continuously until transfer ends.
Figure 7.12 shows an example of the setting procedure for normal mode.
Rev. 2.0, 04/02, page 298 of 906
Address T
Address B
Legend
Address
Address
Address
Address
Where :
T
T
B
B
L
L
N
A
A
A
B
A
B
A
B
= L
= L
= L
= L
= Value set in MARA
= Value set in MARB
= Value set in ETCRA
A
B
A
B
+ SAIDE · (–1)
+ DAIDE · (–1)
Figure 7.11 Operation in Normal Mode
SAID
DAID
· (2
· (2
DTSZ
DTSZ
· (N – 1))
· (N – 1))
Transfer
Address T
Address B
B
B