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Bit 0—Asynchronous Event Counter Interrupt Enable (IENEC)
Bit 0 enables or disables asynchronous event counter interrupt requests.
Bit 0
IENEC
Description
0
Disables asynchronous event counter interrupt requests
(initial value)
1
Enables asynchronous event counter interrupt requests
For details of SCI3 interrupt control, see section 10.2.6 Serial control register 3 (SCR3).
Interrupt Request Register 1 (IRR1)
Bit
Initial value
Read/Write
7
IRRTA
0
R/(W)
*
6
W
5
1
4
IRRI4
0
R/(W)
*
3
IRRI3
0
R/(W)
*
0
IRRI0
0
R/(W)
*
2
IRREC2
0
R/(W)
*
1
IRRI1
0
R/(W)
*
Note:
*
Only a write of 0 for flag clearing is possible
IRR1 is an 8-bit read/write register, in which a corresponding flag is set to 1 when a timer A,
IRQAEC, IRQ
4
, IRQ
3
, IRQ
1
, or IRQ
0
interrupt is requested. The flags are not cleared
automatically when an interrupt is accepted. It is necessary to write 0 to clear each flag.
Bit 7—Timer A Interrupt Request Flag (IRRTA)
Bit 7
IRRTA
Description
0
Clearing conditions:
(initial value)
When IRRTA = 1, it is cleared by writing 0
1
Setting conditions:
When the timer A counter value overflows from H'FF to H'00
Bit 6—Reserved
Bit 6 is reserved; it can only be written with 0.
Bit 5—Reserved
Bit 5 is reserved; it is always read as 1 and cannot be modified.
Содержание H8/38024 Series
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