at91sam7l128 ATMEL Corporation, at91sam7l128 Datasheet - Page 22

• Manufacturer Part Number: at91sam7l128
• Description: At91 Arm Thumb-based Microcontroller
• Manufacturer: ATMEL Corporation

7.4
22
Peripheral DMA Controller
AT91SAM7L128/64 Preliminary
• Handles data transfer between peripherals and memories
• Eleven channels
• Low bus arbitration overhead
• Next Pointer management for reducing interrupt latency requirements
– Embedded Flash interface, up to three programmable wait states
– Prefetch buffer, buffering and anticipating the 16-bit requests, reducing the required
– Key-protected program, erase and lock/unlock sequencer
– Single command for erasing, programming and locking operations
– Interrupt generation in case of forbidden operation
– Two for each USART
– Two for the Debug Unit
– Two for the Serial Peripheral Interface
– Two for the Two Wire Interface
– One for the Analog-to-digital Converter
– One Master Clock cycle needed for a transfer from memory to peripheral
– Two Master Clock cycles needed for a transfer from peripheral to memory
wait states
6257AS–ATARM–28-Feb-08