m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 379

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

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Figure 22.28 Example of CAN Data Frame Transmit Operation
Figure 22.29 Example of CAN Data Frame Receive Operation
2
0
22.2.3 CAN Receive Timing
1
9
C
3 .
B
Figure 22.29 shows an operation example of when the CAN receives a frame.
8 /
0
1
3
0
(1) When the RECREQ bit in the C0MCTLi register (i=0 to 15) is set to "1" (receive requested), the
(2) When the CAN starts receiving the frame, the RECSTATE bit in the C0STR register is set to "1"
(3) After the CAN frame reception is completed, the INVALDTA bit in the C0MCTLi register is set to
(4) After data is written to the message slot, the INVALDATA bit is set to "0" (stops receiving) and the
3
J
G
4
a
NEWDATA bit
INVALDATA bit
RECSUCC bit
SISi bit
CAN bus
RECREQ bit
MBOX3 -
MBOX0 bits
RECSTATE bit
i = 0 to 15
0 -
n
o r
CAN bus
TRMSUCC bit
TRMSTATE bit
SISi bit
SENTDATA bit
TRMACTIVE bit
TRMREQ bit
MBOX3 -
MBOX0 bits
i = 0 to 15
CAN is ready to receive the frame at anytime.
(during reception).
"1" (storing received data), the NEWDATA bit in the C0MCTLi register is set to "1" (receive com-
plete) and the RECSUCC bit in the C0STR register is set to "1" (reception completed).
SISi bit is set to "1" (interrupt requested). The MBOX3 to MBOX0 bits store received message slot
numbers.
3 .
1
u
, 1
3
p
1
2
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M
0
0
3
6
2
C
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"1"
"0"
"1"
"0"
"1"
"0"
"1"
"0"
"1"
"0"
"1"
"0"
"1"
"0"
"1"
"0"
"1"
"0"
"1"
"0"
"1"
"0"
"1"
"0"
, 3
Bus idle
M
Bus idle
3
(1)
Start transmtting
2
C
f o
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Set to "1" by program
simultaneously
4
Start receiving
(2)
3
8
(1)
) T
8
Set to "1" by program
simultaneously
Receive frame
Transmit frame
Receive frame
Transmit frame
Reception completed
Transmission completed
(3)
(2)
(4)
Transmission-completed
message slot number
Intermission field
Reception-completed
message slot number
Intermission field
Bus idle
Bus idle
22. CAN Module