Rev. 2.00, 09/03, page 256 of 690
On-Chip Peripheral Module Request Mode: In this mode a transfer is performed at the transfer
request signal of an on-chip peripheral module. Transfer request signals comprise the transmit data
empty transfer request and receive data full transfer request from the SCIF0 and SCIF2 set by
DMARS0/1, the compare-match timer transfer request from the CMT, and transfer requests from
the USB.
When this mode is selected, if the DMA transfer is enabled (DE = 1, DME = 1, TE = 0, AE = 0,
NMIF = 0), a transfer is performed upon the input of a transfer request signal.
When a transmit data empty transfer request of the SCIF is set as the transfer request, the transfer
destination must be the SCIF’s transmit data register. Likewise, when receive data full transfer
request of the SCIF is set as the transfer request, the transfer source must be the SCIF’s receive
data register. These conditions also apply to the USB. Any address can be specified for data source
and destination, when transfer request is generated by the CMT.
Table 8.6
Selecting On-Chip Peripheral Module Request Modes with RS3 to RS0 Bits
RS3
RS2 RS1 RS0
DMA Transfer
Request
Source
DMA Transfer
Request Signal
Source
Destination
Bus
Mode
1
1
1
0
ADC
AD-conversion end request
ADDR
Any
Cycle
steal
1
1
1
1
CMT
Compare-match transfer
request
Any
Any
Burst/
cycle
steal
Table 8.7
Selecting On-Chip Peripheral Module Request Modes with RS3 to RS0 Bits
CHCR
DMARS
RS[3:0]
MID
RID
DMA Transfer
Request
Source
DMA Transfer
Request Signal
Source
Destination
Bus
Mode
01
SCIF0
transmitter
TXI0
(transmit FIFO data empty)
Any
SCFTDR_0
Cycle
steal
001000
10
SCIF0
receiver
RXI0
(receive FIFO data full)
SCFRDR_0
Any
Cycle
steal
01
SCIF2
transmitter
TXI2
(transmit FIFO data empty)
Any
SCFTDR_2
Cycle
steal
001010
10
SCIF2
receiver
RXI2
(receive FIFO data full)
SCFRDR_2
Any
Cycle
steal
11
USB
transmitter
EP2 FIFO empty transfer
request
Any
EPDR2
Cycle
steal
1000
011100
00
USB
receiver
EP1 FIFO full transfer
request
EPDR1
Any
Cycle
steal
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