126
Interrupts IRQ4–IRQ0 can wake the chip up from the standby state when the relevant interrupt
level is higher than the setting of I3–I0 in the SR register (but only when the RTC 32-kHz
oscillator is used).
6.2.3
IRL Interrupts
IRL interrupts are input by level at pins
IRL3
–
IRL0
and
IRLS3
–
IRLS0
.
IRLS3
–
IRLS0
are
enabled when the IRQLVL bit and IRLSEN bit in interrupt control register 1 (ICR1) are both 1.
The priority level is the higher level indicated by pins
IRL3
–
IRL0
and
IRLS3
–
IRLS0
. An
IRL3
–
IRL0
/
IRLS3
–
IRLS0
value of 0 (0000) indicates the highest-level interrupt request (interrupt
priority level 15). A value of 15 (1111) indicates no interrupt request (interrupt priority level 0).
Figure 6.2 shows an example of IRL interrupt connection. Table 6.3 shows
IRL
/
IRLS
pins and
interrupt levels.
Interrupt
request
Priority
encoder
IRL3
to
IRL0
4
SH7709S
IRL3
to
IRL0
Interrupt
request
Priority
encoder
IRLS3
to
IRLS0
4
IRLS3
to
IRLS0
Figure 6.2 Example of IRL Interrupt Connection
Содержание SH7709S
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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