DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 153

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

5.4
5.4.1
There are seven external interrupts: NMI, IRQ7, and IRQ4 to IRQ0. These interrupts can be used
to restore this LSI from software standby mode. Though IRQ5 is only for the on-chip RTC and
IRQ6 is only for the on-chip USB, the interrupts can be used to restore this LSI from software
standby mode. IRQ5 and IRQ6 are functionally same as IRQ7 and IRQ4 to IRQ0.
NMI Interrupt: NMI is the highest-priority interrupt, and is always accepted by the CPU
regardless of the interrupt control mode or the status of the CPU interrupt mask bits. The NMIEG
bit in SYSCR can be used to select whether an interrupt is requested at a rising edge or a falling
edge on the NMI pin.
IRQ7 to IRQ0 Interrupts: Interrupts IRQ7 to IRQ0 are requested by an input signal at pins IRQ7
to IRQ0. Interrupts IRQ7 to IRQ0 have the following features:
• Using ISCR, it is possible to select whether an interrupt is generated by a low level, falling
• Enabling or disabling of interrupt requests IRQ7 to IRQ0 can be selected with IER.
• The interrupt priority level can be set with IPR.
• The status of interrupt requests IRQ7 to IRQ0 is indicated in ISR. ISR flags can be cleared to 0
A block diagram of IRQn interrupts is shown in figure 5.2.
edge, rising edge, or both edges, at pins IRQ7 to IRQ0
by software.
IRQn input
Note: n = 7 to 0
Interrupt Sources
External Interrupts
IRQnSCA, IRQnSCB
Figure 5.2 Block Diagram of Interrupts IRQn
detection circuit
Edge/level
Clear signal
S
R
IRQnF
Q
Rev.7.00 Dec. 24, 2008 Page 99 of 698
IRQnE
IRQn interrupt
request
REJ09B0074-0700