SH7261 datasheet(880/1348 Pages) RENESAS

880 / 1348 page

Section 19 Controller Area Network (RCAN-ET) [R5S72611] [R5S72613]

Rev. 2.00 Sep. 07, 2007 Page 848 of 1312

REJ09B0320-0200

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:

Initial value:

R/W:

0000000000000000

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*

TXPR1[15:0]

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:

Initial value:

R/W:

0000000000000000

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*

—

TXPR0[15:1]

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

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'.

SH7261 Datasheet(PDF) 880 Page - Renesas Technology Corp