SH7059 Datasheet, PDF (576/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

17. Controller Area Network-II (HCAN-II)
Table 17.11 Limitations on Setting TXPR during Reception
Pφ
20 MHz
16 MHz
Baud Rate
1.0 Mbps
0.5 Mbps
1.0 Mbps
0.5 Mbps
Number of Transmit MB to be Set
Simultaneously
25
30
31
31
10
20
25
30
31
31
Upper-Limit Number of Accesses to MB in Words
36
30
29
No limitation
34
24
18
12
11
No limitation
17.8.2 Transmit Cancellation Setting immediately after Transmission Setting in Bus Idle
When the transmission setting is made and then the transmit cancellation (TXCR) setting is made while the HCAN-II is in
the bus idle state, there are following limitations.
Important: Limitation on transmit cancellation setting immediately after transmission setting in bus idle
CAN bus
Bus idele
SOF
ID
A
t1
t2
Transmit cancellation prohibited period
When the transmission setting (TXPR) is made to a mailbox at the point A shown in the above figure and then transmit
cancellation setting (TXCR) is made at the timing between t1 and t2, transmission may be performed to the CAN bus
regardless of the fact that a flag is set in the abort acknowledge register. (The transmit acknowledge (TXACK) of the
transmitted mailbox is set.)
The t1 and t2 timings are as follows after the transmission setting (TXPR) has been made.
Table 17.12 Transmit Cancellation Prohibited Period
Pφ
20 MHz
20 MHz
Baud Rate
1 Mbps
0.5 Mbps
MB order
ID order
MB order
ID order
t1
1.90 μs
5.05 μs
2.55 μs
5.45 μs
t2
6.30 μs
13.55 μs
7.65 μs
13.55 μs
Rev.3.00 Mar. 12, 2008 Page 486 of 948
REJ09B0177-0300