SH7261 Datasheet, PDF (880/1348 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 19 Controller Area Network (RCAN-ET) [R5S72611] [R5S72613]
When the RCAN-ET changes the state of any TXPR bit position to a '0', an empty slot interrupt
(IRR8) may be generated. This indicates that either a successful or an aborted mailbox
transmission has just been made. If a message transmission is successful it is signalled in the
TXACK register, and if a message transmission abortion is successful it is signalled in the
ABACK register. By checking these registers, the contents of the Message of the corresponding
Mailbox may be modified to prepare for the next transmission.
• TXPR1
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
TXPR1[15:0]
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W*
Note: * Any write operation is ignored.
Read value is always H'0000. Long word access is mandatory when reading or writing
TXPR1/TXPR0. Writing any value to TXPR1 is allowed, however, write operation to TXPR1 has
no effect. Writing to the bit 0 in TXPR0 has no effect.
• TXPR0
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
TXPR0[15:1]
0
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* —
Note: * it is possible only to write a '1' for a Mailbox configured as transmitter.
Bit 15 to 1 — Indicates that the corresponding Mailbox is requested to transmit a CAN Frame.
The bit 15 to 1 corresponds to Mailbox-15 to 1 respectively. When multiple bits are set, the order
of the transmissions is governed by the MCR2 – CAN-ID or Mailbox number.
Bit[15:1]:TXPR0
0
1
Description
Transmit message idle state in corresponding mailbox (Initial value)
[Clearing Condition] Completion of message transmission or message
transmission abortion (automatically cleared)
Transmission request made for corresponding mailbox
Bit 0— Reserved: This bit is always '0' as this is a receive-only Mailbox. Writing a '1' to this bit
position has no effect. The returned value is '0'.
Rev. 2.00 Sep. 07, 2007 Page 848 of 1312
REJ09B0320-0200