mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 1244

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Functional Description
49.4 Functional Description
This section provides a complete functional description of the IRQ module.
49.4.1 External Interrupt Pin
Writing to the IRQPE bit in the SC register, enables or disables the IRQ pin.
49.4.2 IRQ Edge Select
The IRQEDG bit in the SC register determines if the IRQ pin is either falling edge and
low level or rising edge and high level sensitive.
49.4.3 IRQ Sensitivity
The IRQMOD bit in the SC register controls the detection mode of the IRQ module.
1244
IRQMOD
IRQACK
IRQIE
IRQF
Field
3
2
1
0
0
1
IRQ flag
This bit indicates when an IRQ interrupt is detected.
0
1
IRQ acknowledge
Writing 1 to this bit is part of the flag clearing mechanism. For more information about flag clearing, refer
to the functional description of clearing an IRQ interrupt request. This bit always reads as 0.
IRQ interrupt enable
This bit determines whether an IRQ interrupt request is enabled.
0
1
IRQ detection mode
This bit (along with the IRQEDG bit) controls the detection mode of the IRQ pin.
0
1
IRQ pin not enabled
IRQ pin enabled
No IRQ interrupt detected
IRQ interrupt detected
IRQ interrupt requests not enabled
IRQ interrupt requests enabled
IRQ interrupt requests on falling edge only or on rising edge only
IRQ interrupt requests on falling edge and low level or on rising edge and high levels
MCF51JF128 Reference Manual, Rev. 2, 03/2011
IRQ_SC field descriptions (continued)
Preliminary
Description
Freescale Semiconductor, Inc.