SH7144 Datasheet, PDF (226/773 Pages) Renesas Technology Corp – Hitachi SuperH RISC engine

10.5.2 Example of DMA Transfer between External RAM and External Device with
DACK
In this example, an external request, single address mode transfer with external memory as the
transfer source and an external device with DACK as the transfer destination is executed using
DMAC channel 1.
Table 10.7 indicates the transfer conditions and the setting values of each of the registers.
Table 10.7 Transfer Conditions and Register Set Values for Transfer between External
RAM and External Device with DACK
Transfer Conditions
Register
Transfer source: external RAM
SAR_1
Transfer destination: external device with DACK
DAR_1
Transfer count: 32 times
DMATCR_1
Transfer source address: decremented
CHCR_1
Transfer destination address: (setting ineffective)
Transfer request source: external pin (DREQ1) edge
detection
Bus mode: burst
Transfer unit: word
No interrupt request generation at end of transfer
Channel priority ranking: 2 > 0 > 1 > 3
DMAOR
Value
H'00400000
(access by DACK)
H'00000020
H'00002269
H'0201
10.5.3 Example of DMA Transfer between A/D Converter and On-chip Memory (Address
Reload On)
In this example, the on-chip A/D converter channel 0 is the transfer source and on-chip memory is
the transfer destination, and the address reload function is on.
Table 10.8 indicates the transfer conditions and the setting values of each of the registers.
Rev. 2.0, 09/02, page 186 of 732