Datasheet

Table Of Contents
Section 7 DMA Controller (DMAC)
Page 174 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
Address T
Address B
Transfer
IOAR
1 byte or word transfer performed in
response to 1 transfer request
Note:
Address
Address
Where:
T = L
B = L + (–1)
DTID
· (2
DTSZ
· (N–1))
L = Value set in MAR
N = Value set in ETCR
Figure 7.3 Operation in Sequential Mode
The number of transfers is specified as 16 bits in ETCR. ETCR is decremented by 1 each time a
transfer is executed, and when its value reaches H'0000, the DTE bit is cleared and transfer ends.
If the DTIE bit is set to 1 at this time, an interrupt request is sent to the CPU or DTC. The
maximum number of transfers, when H'0000 is set in ETCR, is 65,536. Transfer requests
(activation sources) consist of A/D conversion end interrupt, SCI transmission complete and
reception complete interrupts, and TPU channel 0 to 2 compare match/input capture A interrupts.
External requests can be set for channel B only. Figure 7.4 shows an example of the setting
procedure for sequential mode.