h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 712
h8s-2635
Manufacturer Part Number
h8s-2635
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2635.pdf
(1547 pages)
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Section 16 Controller Area Network (HCAN)
Interrupt and Transmit Data Settings: When mailbox initialization is finished, CPU interrupt
source settings and data settings must be made. Interrupt source settings are made in the mailbox
interrupt register (MBIMR) and interrupt mask register (IMR), while transmit data settings are
made by writing the necessary data from the arbitration field, control field, and data field,
described below, in the corresponding message control (MCx[1] to MCx[8]) and message data
(MDx[1] to MDx[8]).
The number of bytes in the data actually transmitted depends on the data length code (DLC) in the
control field. If a value exceeding the value set in DLC is set in the data field, only the number of
bytes set in DLC will actually be transmitted.
Message Transmission and Interrupts:
Rev. 6.00 Feb 22, 2005 page 652 of 1484
REJ09B0103-0600
CPU interrupt source setting
Transmission acknowledge and transmission abort acknowledge interrupts can be masked for
individual mailboxes in the mailbox interrupt mask register (MBIMR). Interrupt register (IRR)
interrupts can be masked in the interrupt mask register (IMR).
Arbitration field setting
In the arbitration field, the 11-bit identifier (STD_ID0 to STD_ID10) and RTR bit (standard
format) or 29-bit identifier (STD_ID0 to STD_ID10, EXT_ID0 to EXT_ID17) and IDE, RTR
bit (extended format) are set. The registers to be set are MCx[5] to MCx[8].
Control field setting
In the control field, the byte length of the data to be transmitted is set in DLC0 to DLC3. The
register to be set is MCx[1].
Data field setting
In the data field, the data to be transmitted is set in byte units in the range of 0 to 8 bytes. The
registers to be set are MDx[1] to MDx[8].
Message transmission wait
If message transmission is to be performed after completion of the message control (MCx[1] to
MCx[8]) and message data (MDx[1] to MDx[8]).settings, transmission is started by setting the
corresponding mailbox transmit wait bit (TXPR1 to TXPR15) to 1 in the transmit wait register
(TXPR). The following two transmission methods can be used:
a. Transmission order determined by message identifier priority
b. Transmission order determined by mailbox number priority
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