Section 5 Interrupt Controller (INTC)
Rev. 2.00 Mar 09, 2006 page 194 of 906
REJ09B0292-0200
5.6
Sampling of Pins
IRL3
IRL3
IRL3
IRL3
–
IRL0
IRL0
IRL0
IRL0
Signals on interrupt pins
IRL3
to
IRL0
pass through the noise canceler before being sent by the
interrupt controller to the CPU as interrupt requests, as shown in figure 5.10. The noise canceler
cancels noise that changes in short cycles. The CPU samples the interrupt requests between
executing instructions. During this period, the noise canceler output changes according to the
noise-eliminated pin level, so the pin level must be held until the CPU samples it. This means that
interrupt sources generally must not be cleared inside interrupt routines.
When an external vector is fetched, the interrupt source can also be cleared when the external
vector fetch cycle is detected.
Interrupt acceptance
signal from CPU
Interrupt request
to CPU
Noise canceler
output
Cleared when interrupt is accepted
IRL3
–
IRL0
pin level
1011 for
1 clock
due to
noise
Level 2 interrupt
Level 6 interrupt
1111
1111
1101
1001
1111
1101
1001
IRL0
IRL1
IRL2
IRL3
CPU
Interrupt
controller
Noise
canceler
Interrupt
request
Interrupt
accepted
Figure 5.10
IRL3
IRL3
IRL3
IRL3
–
IRL0
IRL0
IRL0
IRL0
Pin Sampling
Содержание SH7616
Страница 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...