68HC05PL4 datasheet(29/98 Pages) FREESCALE

29 / 98 page

April 30, 1998

GENERAL RELEASE SPECIFICATION

MC68HC05PL4

INTERRUPTS

REV 2.0

4-5

Figure 4-3. External Interrupt Logic

4.4.2 Miscellaneous Control and Status Register

IRQEN — External Interrupt Request Enable

This read/write bit enables external interrupts. Reset clears the IRQEN bit.

0 = External interrupt processing disabled. LED/IRQ pin return to

normal LED function

1 = External interrupt processing enabled. LED/IRQ pin set to IRQ

function

IRQS— External Interrupt Sensitivity

This bit makes the external interrupt inputs level-triggered as well as edge-trig-

gered.

0 = IRQ negative edge-triggered and low level-triggered.

1 = IRQ negative edge-triggered only.

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

MICSR R

IRQEN

IRQS

TCMPEN TCAPEN

LED

COPON

POR

$001C W

RESET

00000000

Figure 4-4. Miscellaneous Control and Status Register (MICSR)

Edge and Level Sensitive

IRQS

VDD

LED/IRQ

Power On Reset

PH2

BIH,BIL instruction

External Reset

External Interrupt

Being Serviced

(Read of Vectors)

IRQEN

LED

INTERRUPT

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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