Features - NXP Semiconductors MC9S08SU16 Reference Manual

IRQ

4.3.1 Features

Features of the IRQ module include:
• IRQ signal is from Intermodule crossbar Output, XBAR_OUT15
• IRQ Interrupt Control Bits
• Programmable Edge-only or Edge and Level Interrupt Sensitivity
• Automatic Interrupt Acknowledge
A low level applied to the interrupt request (IRQ) can latch a CPU interrupt request. The
following figure shows the structure of the IRQ module:
1
0
IRQ
S
IRQPE
IRQEDG
To pullup enable logic for IRQ
IRQ is managed by the IRQSC status and control register. When the IRQ function is
enabled, synchronous logic monitors the Xbar_OUT15 for edge-only or edge-and-level
events. When the MCU is in stop mode and system clocks are shut down, a separate
asynchronous path is used so that the IRQ, if enabled, can wake the MCU.
62
IRQACK
RESET
V
DD
CLR
D
CK
IRQMOD
IRQPDD
Figure 4-3. IRQ module block diagram
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
SYNCHRO-
NIZER
BUSCLK
Q
SYNCHRO-
NIZER
STOP
BYPASS
TO INTERNAL
MODULES
WAKE-UP
INPUTS
TO CPU FOR
BIL/BIH
INSTRUCTIONS
IRQF
STOP
IRQIE
IRQ
INTERRUPT
REQUEST
NXP Semiconductors