R5S72011 RENESAS [Renesas Technology Corp], R5S72011 Datasheet - Page 873
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R5S72011
Manufacturer Part Number
R5S72011
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.R5S72011.pdf
(1196 pages)
- Current page: 873 of 1196
- Download datasheet (8Mb)
19.5.2
TXCR0 is a 16-bit read/conditionally-write registers. The TXCR0 controls Mailbox-15 to
Mailbox-1.This register is used by the CPU to request the pending transmission requests in the
TXPR to be cancelled. To clear the corresponding bit in the TXPR the CPU must write a '1' to the
bit position in the TXCR. Writing a '0' has no effect.
When an abort has succeeded the CAN controller clears the corresponding TXPR + TXCR bits,
and sets the corresponding ABACK bit. However, once a Mailbox has started a transmission, it
cannot be cancelled by this bit. In such a case, if the transmission finishes in success, the CAN
controller clears the corresponding TXPR + TXCR bit, and sets the corresponding TXACK bit,
however, if the transmission fails due to a bus arbitration loss or an error on the bus, the CAN
controller clears the corresponding TXPR + TXCR bit, and sets the corresponding ABACK bit. If
an attempt is made by the CPU to clear a mailbox transmission that is not transmit-pending it has
no effect. In this case the CPU will be not able at all to set the TXCR flag.
• TXCR0
Note: * Only writing a '1' to a Mailbox that is requested for transmission and is configured as
Bit 15 to 1 — Requests the corresponding Mailbox, that is in the queue for transmission, to cancel
its transmission. The bit 15 to 1 corresponds to Mailbox-15 to 1 (and TXPR0[15:1]) respectively.
Bit 0 — This bit is always '0' as this is a receive-only mailbox. Writing a '1' to this bit position has
no effect and always read back as a '0'.
Bit[15:1]:TXCR0
0
1
Initial value:
R/W:
Bit:
Transmit Cancel Register 0 (TXCR0)
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*
transmit.
15
0
14
0
Description
Transmit message cancellation idle state in corresponding mailbox (Initial
value)
[Clearing Condition] Completion of transmit message cancellation
(automatically cleared)
Transmission cancellation request made for corresponding mailbox
13
0
12
0
11
0
10
0
9
0
TXCR0[15:1]
8
0
Section 19 Controller Area Network (RCAN-ET)
7
0
Rev. 2.00 Sep. 07, 2007 Page 845 of 1164
6
0
5
0
4
0
3
0
REJ09B0321-0200
2
0
1
0
—
0
0
0
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