Section 13 Controller Area Network (HCAN)
Rev. 3.00 Mar. 14, 2006 Page 469 of 804
REJ09B0104-0300
Bit Bit
Name
Initial
Value R/W
Description
3, 2
All
0
Reserved
These bits are always read as 0. The write value
should always be 0.
1
IRR9
0
R
Unread Interrupt Flag
Status flag indicating that a receive message has
been overwritten before being read.
[Setting condition]
When UMSR (unread message status register) is
set
[Clearing condition]
Clearing of all bits in UMSR (unread message
status register)
0 IRR8 0
R/(W)
*
Mailbox Empty Interrupt Flag
Status flag indicating that the next transmit
message can be stored in the mailbox.
[Setting condition]
•
When TXPR (transmit wait register) is cleared
by completion of transmission or completion
of transmission abort
[Clearing condition]
•
Writing 1
(When the CPU is used to clear this flag by
writing 1 while the corresponding interrupt is
enabled, be sure to read the flag after writing
1 to it.)
Note:
*
Only 1 can be written to clear the flag.
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Содержание H8SX series
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