Renesas Stereo System SH7709S User Manual
Rev. 5.00, 09/03, page 138 of 760
6.3.6
Interrupt Request Register 0 (IRR0)
IRR0 is an 8-bit register that indicates interrupt requests from external input pins IRQ0 to IRQ5
and PINT0 to PINT15. This register is initialized to H'00 by a power-on reset or manual reset, but
is not initialized in standby mode.
and PINT0 to PINT15. This register is initialized to H'00 by a power-on reset or manual reset, but
is not initialized in standby mode.
Bit:
7
6
5
4
3
2
1
0
PINT0R PINT1R
IRQ5R
IRQ4R
IRQ3R
IRQ2R
IRQ1R
IRQ0R
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R/W
R/W
R/W
R/W
R/W
R/W
When clearing an IRQ5R–IRQ0R bit to 0, read the bit while bit set to 1, and then write 0. In this
case, 0 should be written only to the bits to be cleared and 1 to the other bits. The contents of the
bits to which 1 is written do not change.
case, 0 should be written only to the bits to be cleared and 1 to the other bits. The contents of the
bits to which 1 is written do not change.
Bit 7—PINT0 to PINT7 Interrupt Request (PINT0R): Indicates whether there is interrupt
request input to pins PINT0 to PINT7.
request input to pins PINT0 to PINT7.
Bit 7: PINT0R
Description
0
No interrupt request to pins PINT0 to PINT7
(Initial value)
1
Interrupt to pins PINT0 to PINT7
Bit 6—PINT8 to PINT15 Interrupt Request (PINT1R): Indicates whether there is interrupt
request input to pins PINT8 to PINT15.
request input to pins PINT8 to PINT15.
Bit 6: PINT1R
Description
0
No interrupt request input to pins PINT8 to PINT15
(Initial value)
1
Interrupt request input to pins PINT8 to PINT15
Bit 5—IRQ5 Interrupt Request (IRQ5R): Indicates whether there is interrupt request input to
the IRQ5 pin. When edge detection mode is set for IRQ5, an interrupt request is cleared by
clearing the IRQ5R bit.
the IRQ5 pin. When edge detection mode is set for IRQ5, an interrupt request is cleared by
clearing the IRQ5R bit.
Bit 5: IRQ5R
Description
0
No interrupt request input to IRQ5 pin
(Initial value)
1
Interrupt request input to IRQ5 pin