MPC823 datasheet(21/74 Pages) MOTOROLA

21 / 74 page

Communication Processor Module

MOTOROLA

MPC823 REFERENCE MANUAL

16-399

Figure 16-116 illustrates an example of the RX buffer descriptor process. It shows the

resulting state of the RX buffer descriptors after they receive 10 characters, an idle period,

and five characters (one with a framing error). The example assumes that MRBLR = 8 in the

SMCx parameter RAM.

Figure 16-116. SMCx UART Receive Buffer Descriptor Example

MRBLR = 8 BYTES FOR THIS SMC

BUFFER

BYTE 1

BYTE 2

BYTE 8

ETC.

8 BYTES

LONG IDLE PERIOD

FOURTH CHARACTER

HAS FRAMING ERROR!

5 CHARS

10 CHARS

CHARACTERS

RECEIVED BY UART

TIME

BUFFER

BYTE 9

BYTE 10

8 BYTES

BUFFER

BYTE 1

BYTE 2

8 BYTES

BYTE 4 HAS

FRAMING ERROR

BUFFER

FULL

BYTE 3

BYTE 4 ERROR!

LENGTH

32-BIT BUFFER POINTER

RECEIVE BD 0

STATUS

0008

POINTER

LENGTH

32-BIT BUFFER POINTER

RECEIVE BD 1

STATUS

0002

POINTER

LENGTH

32-BIT BUFFER POINTER

RECEIVE BD 2

STATUS

0004

POINTER

LENGTH

32-BIT BUFFER POINTER

RECEIVE BD 3

STATUS

XXXX

POINTER

BUFFER

BYTE 5

8 BYTES

RECEPTION

STILL IN

PROGRESS

WITH THIS

BUFFER

PRESENT

TIME

IDLE TIMEOUT

OCCURRED

EMPTY

ADDITIONAL

BYTES WILL BE

STORED UNLESS IDLE

COUNT EXPIRES

(MAX_IDL)

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