mc68hc05pl4b Freescale Semiconductor, Inc, mc68hc05pl4b Datasheet - Page 29

• Manufacturer Part Number: mc68hc05pl4b
• Description: Low-cost Single-chip Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

4.4.2 Miscellaneous Control and Status Register
MC68HC05PL4
REV 2.0
LED/IRQ
LED
IRQEN — External Interrupt Request Enable
IRQS— External Interrupt Sensitivity
RESET
MICSR
$001C
This read/write bit enables external interrupts. Reset clears the IRQEN bit.
This bit makes the external interrupt inputs level-triggered as well as edge-trig-
gered.
IRQEN
0 = External interrupt processing disabled. LED/IRQ pin return to
1 = External interrupt processing enabled. LED/IRQ pin set to IRQ
0 = IRQ negative edge-triggered and low level-triggered.
1 = IRQ negative edge-triggered only.
Figure 4-4. Miscellaneous Control and Status Register (MICSR)
IRQS
W
R
normal LED function
function
IRQEN
BIT 7
0
Freescale Semiconductor, Inc.
Figure 4-3. External Interrupt Logic
For More Information On This Product,
PH2
IRQS
BIT 6
0
Go to: www.freescale.com
Edge and Level Sensitive
VDD
TCMPEN
BIT 5
INTERRUPTS
April 30, 1998
0
D
D
R
Q
Q
TCAPEN
BIT 4
0
GENERAL RELEASE SPECIFICATION
BIT 3
0
BIH,BIL instruction
BIT 2
LED
0
COPON
Power On Reset
External Reset
External Interrupt
Being Serviced
(Read of Vectors)
BIT 1
0
INTERRUPT
BIT 0
POR
0
4-5