SH7058 Datasheet, PDF (652/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

16.8 Usage Notes
16.8.1 TXPR Setting during Reception
When the HCAN-II is used with the baud rate set to 1 Mbps and the transmission setting is made
during message reception, there are following limitations on the number of transmit mailboxes
(MB) and the number of accesses to mailboxes. Note that there is no limitation when 500 kbps of
baud rate is used.
Important: Limitations on setting TXPR during reception
There are limitations on the number of mailboxes set by TXPR and the number of accesses to
mailboxes.
Table 16.11 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
16.8.2 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
Rev. 3.0, 09/04, page 611 of 1086