HD64F36034 datasheet(339/592 Pages) RENESAS

339 / 592 page

Section 15 Controller Area Network for Tiny (TinyCAN)

Rev. 4.00 Mar. 15, 2006 Page 307 of 556

REJ09B0026-0400

15.3.7

Transmit Pending Register (TXPR)

TXPR sets transmit pending (CAN bus arbitration wait) for the transmit message that is stored in a

Mailbox. Setting the corresponding bit in TXPR to 1 enables a message to be transmitted. Writing

0 to the bit in TXPR is ignored.

Bit

Bit Name

Initial

Value

R/W

Description

7 to 4

—

All 0

—

Reserved

These bits are always read as 0.

MB3

MB2

MB1

R/W

[Setting condition]

When the corresponding MBCR bit for a mailbox is 0, the

corresponding bit in TXPR is set to 1

(n = 3 to 1)

[Clearing conditions]

• When message transmission has completed

successfully (TXACKn set)

• When transmission cancellation for an untransmitted

message has finished (ABACKn set)

• When a transmission cancellation request has

occurred during message transmission, and an error

occurs or arbitration is lost on the CAN bus (ABACKn

set)

• When a transmit error or arbitration loss occurred with

the corresponding DART bit for a message being

transmitted set to 1

If the message is not transmitted successfully, the MBn

bit is not cleared to 0. If any of these MB bits in TXPR are

cleared to 0, the EMPI bit in TCIRR1 is set to 1. The

TinyCAN automatically attempts retransmission as long

as the DART bit in the message control of the

corresponding Mailbox is not set to 1 or the

corresponding bit in TXCR is not set to 1.

Note:

When the MBn bit in MBCR is set to 1, the

TinyCAN does not transmit a message even if

the MBn bit in TXPR is set to 1. To clear the

MBn bit in TXPR to 0, set the MBn bit in TXCR

to 1 beforehand.

—

Reserved

This bit is always read as 0. This bit is relevant to the

receive-only Mailbox, and its value cannot be changed.

HD64F36034 Datasheet(PDF) 339 Page - Renesas Technology Corp

HD64F36034 Datasheet(HTML) 339 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL