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Bit
Bit Name
Initial Value
R/W
Description
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
Note:
*
Only 1 can be written to clear the flag.
Содержание H8S/2627
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