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MB90420/5 (A) SERIES F
Initialization
Select AMR0.
ID28 to ID18
Message buffer 13
Message buffer 14
Message buffer 15
Message receiving
ID28 to ID18
Message receiving
Message buffer 13
Message buffer 14
Message buffer 15
Message receiving
Message receiving
Message buffer 13
Message buffer 14
Message buffer 15
Message receiving
Message receiving
Message buffer 13
Message buffer 14
Message buffer 15
Message receiving
Message receiving
Message buffer 13
Message buffer 14
Message buffer 15
Fig. 23.9 Examples of Operation of Multi-level Message Buffer
Note:
Four messages are received with the identical acceptance filter set in message buffers 13, 14 and
15.
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
AMS15, AMS14, AMS13
• • •
AMSR
10 10 10
AM28 to AM18
AMS0
0000 1111 111
• • •
0101 0000 000
0
0101 0000 000
0
0101 0000 000
0
"The receive message is stored in message buffer 13.
0101 1111 000
0
0101 1111 000
0
0101 0000 000
0
0101 0000 000
0
"The receive message is stored in message buffer 14.
0101 1111 001
0
0101 1111 000
0
0101 1111 001
0
0101 0000 000
0
"The receive message is stored in message buffer 15.
0101 1111 010
0
0101 1111 000
0
0101 1111 001
0
0101 1111 010
0
"An overrun occurs (ROVR13 = 1)the receive message is stored in message buffer 13.
0101 1111 011
0
0101 1111 011
0
0101 1111 001
0
0101 1111 010
0
IDE
• • •
RCR
0
• • •
ROVRR
0
• • •
Mask
IDE
• • •
• • •
RCR
0
• • •
ROVRR
0
• • •
• • •
• • •
RCR
0
• • •
ROVRR
0
• • •
• • •
• • •
RCR
1
• • •
ROVRR
0
• • •
• • •
• • •
RCR
1
• • •
ROVRR
0
• • •
23-42
RC15, RC14, RC13
• • •
0
0
• • •
0
0
ROVR15, ROVR14, ROVR13
• • •
0
1
• • •
0
0
• • •
1
1
• • •
0
0
• • •
1
1
• • •
0
0
• • •
1
1
• • •
0
1
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