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CHAPTER 17 DTP/EXTERNAL INTERRUPTS
Table 17.3-2 Function of DTP/External Interrupt Factor Register (EIRR1)
Bit Name Function
bit8
to
bit15
ER15 to ER8(EIRR1),
DTP/External interrupt
request flag bits
These bits are set to "1" when the edges or level signals set by the
detection condition select bits in the detection level setting register
(ELVR1:LB, LA) are inputted to the DTP/external interrupt pins.
When set to "1": When the DTP/external interrupt request
enable bit (ENIR1:EN) is set to "1", an
interrupt request is generated to the
corresponding DTP/external interrupt channel.
When set to "0": Cleared
When set to "1": No effect
Note:
Reading by read-modify-write type instructions always returns
"1".
If more than one DTP/external interrupt request is enabled
(ENIR1:EN = 1), clear only the bit in the channel that accepts
an interrupt (EIRR1:ER = 0). No other bits must be cleared
unconditionally.
Reference:
When the EI
2
OS is started, the interrupt request flag bit is
automatically cleared after the completion of data transfer
(EIRR1:ER = 0).