Hitachi SH7095 Hardware User Manual page 239

Bit 15: DM1 Bit 14: DM0
0 0
1
1 0
1
• Bits 13, 12—Source Address Mode Bits 1, 0 (SM1, SM0): Select whether the DMA source
address is incremented, decremented or left fixed. In the single address mode, SM1 and SM0
are ignored when transfers are made from external devices with DACK to memory-mapped
external devices, on-chip peripheral modules, or external memory. For a 16-byte transfer, the
address is incremented +16 regardless of the SM1 and SM0 values. SM1 and SM0 are
initialized to 00 by resets and the standby mode. Values are held during a module standby.
Bit 13: SM1 Bit 12: SM0
0 0
1
1 0
1
• Bits 11, 10—Transfer Size Bits (TS1, TS0): Select the DMA transfer size. When the transfer
source or destination is an on-chip peripheral module register for which an access size has
been specified, that size must be selected. During 16-byte transfers, set the transfer address
mode bit for dual address mode. TS1 and TS0 are initialized to 00 by resets and in the standby
mode. Values are held during a module standby.
Bit 11: TS1 Bit 10: TS0
0 0
1
1 0
1
228 Hitachi
Description
Fixed destination address (Initial value)
Destination address is incremented (+1 for byte transfer size,
+2 for word transfer size, +4 for longword transfer size, +16
for 16-byte transfer size)
Destination 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
Fixed source address (+16 for 16-byte transfer size) (Initial
value)
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 (initial value)
Word (2-byte) unit
Longword (4-byte) unit
16-byte unit (4 longword transmissions)