HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 476

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

Bits 13 and 12—Source Address Mode Bits 1, 0 (SM1, SM0): Select whether the DMA source
address is incremented, decremented or left fixed. (In single address mode, SM1 and SM0 are
ignored when transfers are made from an external device with DACK to a memory-mapped
external device, or external memory.) For a 16-byte transfer, the address is incremented by +16
regardless of the SM1 and SM0 values. SM1 and SM0 are initialized to 00 by a reset and in
standby mode. Values are retained during a module standby.
Bit 13: SM1
0
1
Bits 11 and 10—Transfer Size Bits (TS1, TS0): Select the DMA transfer size. When 11 is set to
bits TS1 and TS0 (in the 16-byte unit), request mode is available only in auto-request mode and at
edge detection in external request mode. When 11 is set to bits TS1 and TS0 (in the 16-byte unit)
and level detection in external request mode and internal peripheral-module request mode are set,
system operations are not guaranteed. TS1 and TS0 are initialized to 00 by a reset and in standby
mode. Values are retained during a module standby.
Bit 11: TS1
0
1
Bit 9—Auto Request Mode Bit (AR): Selects either auto-request mode (in which transfer requests
are generated automatically within the DMAC) or a mode using external requests or requests from
on-chip peripheral modules. The AR bit is initialized to 0 by a reset and in standby mode. Its value
is retained during a module standby.
Bit 9: AR
0
1
Bit 12: SM0
0
1
0
1
Bit 10: TS0
0
1
0
1
Description
External/on-chip peripheral module request mode
Auto-request mode
Description
Fixed source address (+16 for 16-byte transfer size)
Source address is incremented (+1 for byte transfer size, +2
for word transfer size, +4 for longword transfer size, +16 for
16-byte transfer size)
Source address is decremented (–1 for byte transfer size, –2
for word transfer size, –4 for longword transfer size, +16 for
16-byte transfer size)
Reserved (setting prohibited)
Description
Byte unit
Word (2-byte) unit
Longword (4-byte) unit
16-byte unit (4 longword transfers)
(Initial value)
(initial value)
(Initial value)
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