Page 95 - Embedded Microprocessor Systems Real World Design

-

To
DMA CONTROLLER WRITES BLOCK OF INTERRUPT cpu
m DATATO SUCCESSIVE
4
LOCATIONS IN MEMORY
INCOMING SERIAL DATA ............

CONTROLLER
DMA CONTROLLER READS
DATA FROM SUCCESSIM RY
............
OUTGOING SERIAL DATA

DMA TRANSFER FROM UART DMA REQUEST
FROM UART I
HOLD

Bus cpu DMA CONTROLLER DMA CONTROLLER cW
(READING MEMORY) (WRITING UART)
3 OMA TRANSFER TO UART
B

% HLDA

Figure 2.24
DMA Transfer Example.