SH7047F Datasheet, PDF (64/85 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7047 Series

Section 5 Example 5
(Remote Frame)
5.1 Transmission and Reception Specifications
Remote frame transmission and reception in the standard format using two SH7047F devices.
Common Transmission and Reception Specifications
• The data transfer speed is 250 kbps (during 50 MHz operation).
• The identifier is H'555.
• The identifier is masked and reception takes place when a match occurs.
Remote Frame Transmission Specifications
• Mailbox 1 is used for remote frame transmission and data frame reception.
• Eight bytes of data are requested.
• The message reception interrupt (IRR1) is used.
(a) After remote frame transmission the system enters message reception interrupt wait status.
(b) The reception end flag is cleared and message reception interrupts are prohibited within the
message reception interrupt routine.
(c) When the data is received DTC settings are made and the software is triggered within the
message reception interrupt routine, and the received data is stored in on-chip RAM.
(d) Block transfer mode is used for the DTC transfer, and the 8 bytes of data are transferred as
a single block.
• The DTC transfer end interrupt is used.
Triggering of the DTC software is prohibited within the DTC transfer end interrupt routine,
completing the operation.
Remote Frame Reception Specifications
• Mailbox 1 is used for remote frame reception and data frame transmission.
• The data frame is prepared in advance, and the automatic transmission function (ATX) is used.
• The data transmitted is H'55, H'66, H'77, H'88, H'99, H'AA, H'BB, H'FF.
• The remote frame request interrupt (IRR2) is used.
(a) The remote frame reception end flag is cleared and reception interrupts are prohibited
within the remote frame request interrupt routine, and the data frame transmission end flag
is polled.
Rev. 1.00, 08/03, page 56 of 74