HD64F2638F20J Datasheet, PDF (720/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 16 Controller Area Network (HCAN)
H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
complete register (RXPR) has been cleared, the unread message register (UMSR) is set. If the
unread interrupt flag (IRR9) in the interrupt mask register (IMR) is set to the interrupt enable
value at this time, an interrupt can be sent to the CPU. Figure 16-10 shows a flowchart of
unread message overwriting.
Unread message overwrite
UMSR = 1
IRR9 = 1
IMR9 = 1?
Yes
No
Interrupt to CPU
Clear IRR9
Message control/message data read
End
: Settings by user
: Processing by hardware
Figure 16-10 Unread Message Overwrite Flowchart
Page 670 of 1458
REJ09B0103-0800 Rev. 8.00
May 28, 2010