Fujitsu FR81S User Manual
CHAPTER 8: DMA CONTROLLER (DMAC)
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : DMA CONTROLLER (DMAC)
FUJITSU SEMICONDUCTOR CONFIDENTIAL
14
[bit14] SAR (Source Address Reload) : Transfer source address reload
This bit specifies the transfer source address register reload. When specifying a reload, the transfer source
address register value is returned to the initial value at the end of the transfer. When disabling a reload, the
transfer source address register will point to the next access address to the last address at the end of the
transfer.
SAR
Transfer Source address reload specified
0
Reload disabled (initial value)
1
Reload
[bit13, bit12] SAC (Source Address Count) : Transfer source address count
These bits specify the address update once for each transfer of the transfer source address. The update
values when specifying "increment/decrement" will be one of the values, 1, 2, 4 depending on the transfer
size (DCCRn:TS).
SAC[1:0]
Transfer Source address count
00
Address increment (initial value)
01
Address decrement
10
Reserved (setting is prohibited)
11
Address fixed
[bit11] DT (Destination Type) : Transfer destination type
The setting values are different depending on the combinations of DMA transfer request source
(DCCR.RS[1:0]), transfer source address (DSAR), and transfer destination address (DDAR). As for the
setting, see "Setting the ST Bit (Transfer source type) and DT Bit (Transfer destination type)".
DT
Transfer destination type
0
See " Setting the ST Bit (Transfer source type) and DT Bit (Transfer destination
type)".
1
[bit10] DAR (Destination Address Reload) : Transfer destination address reload
This bit specifies the transfer destination address register reload. When specifying a reload, the transfer
destination address register value is returned to the initial value at the end of the transfer. When disabling a
reload, the transfer destination address register will point to the next access address to the last address at the
end of the transfer.
DAR
Transfer destination address reload specified
0
Reload disabled (initial value)
1
Reload
MB91520 Series
MN705-00010-1v0-E
313