HD64F36034 datasheet(359/592 Pages) RENESAS

359 / 592 page

Section 15 Controller Area Network for Tiny (TinyCAN)

Rev. 4.00 Mar. 15, 2006 Page 327 of 556

REJ09B0026-0400

15.5.3

Message Transmission

Message Transmission Request: Figure 15.6 shows a transmission flowchart.

DART = 1?

MBn in TXCR = 1?

Yes

Update data in Mailbox n

(n = 1 to 3)

Write 1 to MBn in TXPR

Internal arbitration determination

Transmission start

Error detected or

CAN bus arbitration lost?

MBn in TXACK = 1?

Transmission completed

• Clear MBn in TXPR to 0

• Set MBn in TXACK to 1

• Mailbox empty interrupt (EMPI)

occurred (when EMPIM = 0)

Clear EMPI in TCIRR1 to 0

Read TCIRR

Read 0 from MBn in TXACK

Clear MBn in TXACK to 0

Read 1 from MBn in ABACK

Clear MBn in ABACK to 0

Read 0 from MBn in ABACK

Yes

Transmission pending?

MBn in TXCR = 1?

Yes

Other interrupt processing

Note: Processing in a shaded box requires setting by software.

Transmission canceled

• Clear MBn in TXPR to 0

• Clear MBn in TXCR to 0 (when MBn in TXCR = 1)

• Set MBn in ABACK to 1

• Mailbox empty interrupt (EMPI) occurred

(when EMPIM = 0)

EMPI in TCIRR1 = 1?

Clear EMPI in TCIRR1 to 0

TinyCAN in normal mode

(MBn in MBCR = 0)

Transmit processing for

Mailbox n completed

Figure 15.6 Transmission Request Flowchart

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