Atmel Evaluation Kit for AT32uC3A0512, 32-Bit AVR Microcontroller Atmel ATEVK1105 ATEVK1105 Data Sheet
Product codes
ATEVK1105
156
AT32UC3A
21.4.9
Priority
If more then one PDCA channel is requesting transfer at a given time, the PDCA channels are
prioritized by their channel number. Channels with lower numbers have priority over channels
with higher numbers, giving channel 0 the highest priority.
21.4.10
Error Handling
If the memory address is set to point to an invalid location in memory, an error will occur when
the PDCA tries to perform a transfer. When an error occurs, the Transfer Error flag (TERR) in
the Interrupt Status Register will be set and the DMA channel that caused the error will be
stopped. In order to restart the channel, the user must program the Memory Address Register to
a valid address and then write the Error Clear bit (ECLR) in the Control Register (CR) to ‘1’. An
interrupt can optionally be triggered on errors by writing the TERR-bit in the Interrupt Enable
Register (IER) to ‘1’.
21.5
User Interface
21.5.1
Memory Map Overview
Note:
The number of channels is implementation specific. See part documentation for details.
21.5.2
Channel Memory Map
Table 21-1.
Register Map Overview
Address Range
Contents
0x0000 - 0x003F
DMA channel 0 configuration registers
0x0040 - 0x007F
DMA channel 1 configuration registers
0x0080 - 0x00BF
DMA channel 2 configuration registers
0x00C0 - 0x00FF
DMA channel 3 configuration registers
0x0100 - 0x013F
DMA channel 4 configuration registers
-
-
-
DMA channel n-1 configuration registers
Offset
Register
Register Name
Access
Reset
0x00
Memory Address Register
MAR
Read/Write
0x00000000
0x04
Peripheral Select Register
PSR
Read/Write
*
0x08
Transfer Counter Register
TCR
Read/Write
0x00000000
0x0C
Memory Address Reload Register
MARR
Read/Write
0x00000000
0x10
Transfer Counter Reload Register
TCRR
Read/Write
0x00000000
0x14
Control Register
CR
Write-only
-
0x18
Mode Register
MR
Read/Write
0x00000000
0x1C
Status Register
SR
Read-only
0x00000000
0x20
Interrupt Enable Register
IER
Write-only
-
32058K
AVR32-01/12