MC68HC705SR3 MOTOROLA [Motorola, Inc], MC68HC705SR3 Datasheet - Page 29

• Manufacturer Part Number: MC68HC705SR3
• Description: High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller Units
• Manufacturer: MOTOROLA [Motorola, Inc]

3.4
The port pin PD6 is configured as IRQ2 by setting the IRQ2E bit in the MCR. The external interrupt
IRQ2 behaves similar to IRQ except it is edge-triggered only.
See Section 5.2.2.2 for details on the external interrupt IRQ2.
3.5
All I/O ports, when programmed as outputs, can source or sink a current of 10mA for driving LEDs
directly. By setting the PIL bit in the Port Option Register (at $0A), PB5-PB7 can be programmed
to a low-current mode that source or sink only a current of 2mA when programmed as output. This
allows a direct drive to low current LEDs.
Note:
MC68HC05SR3
Although the ports each has high current drive capability, designs should limit the total
port currents to not more than 100mA.
PD6 — IRQ2
Programmable Current Drive
Freescale Semiconductor, Inc.
For More Information On This Product,
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Figure 3-2 Typical I
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INPUT/OUTPUT PORTS
1
2
OL
PB5-PB7 in low current mode
V
OL
vs V
(volts)
OL
3
@V
All ports
DD
typical
=5V
4
best case
worst case
best case
worst case
typical
5
MOTOROLA
TPG
3-3
3