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Section 3 Exception Handling
Rev. 6.00 Sep 12, 2006 page 68 of 526
REJ09B0326-0600
Interrupt Request Register 1 (IRR1)
Bit
7 6 5 4 3 2 1 0
IRRTB1
IRRTA
IRRI3 IRRI2 IRRI1 IRRI0
Initial
value 0 0 0 1 0 0 0 0
Read/Write R/W
*
R/W
*
R/W
*
R/W
*
R/W
*
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 B1,
timer A, or IRQ
3
to 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. Upon reset, IRR1 is initialized to
H'10.
Bit 7
Timer B1 Interrupt Request Flag (IRRTB1)
Bit 7: IRRTB1
Description
0
Clearing condition:
(initial value)
When IRRTB1 = 1, it is cleared by writing 0
1 Setting
condition:
When the timer B1 counter value overflows from H'FF to H'00
Bit 6
Timer A Interrupt Request Flag (IRRTA)
Bit 6: IRRTA
Description
0
Clearing condition:
(initial value)
When IRRTA = 1, it is cleared by writing 0
1 Setting
condition:
When the timer A counter value overflows from H'FF to H'00
Bit 5
Reserved Bit:
Bit 5 is reserved: it is always read as 0 and cannot be modified.
Bit 4
Reserved Bit:
Bit 4 is reserved; it is always read as 1, and cannot be modified.
Summary of Contents for F-ZTAT H8/3642A Series
Page 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Page 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Page 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Page 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Page 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Page 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Page 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Page 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Page 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...