mc68hc908rc24d Freescale Semiconductor, Inc, mc68hc908rc24d Datasheet - Page 29

• Manufacturer Part Number: mc68hc908rc24d
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

1.5.3 External Interrupt Pin (IRQ1)
1.5.4 OSC1 and OSC2
1.5.5 RST
1.5.6 IRO
1.5.7 Port A Input/Output Pins (PTA7–PTA0)
MC68HC908RC24 — Rev. 1.1
Freescale Semiconductor
NOTE:
NOTE:
IRQ1 is an asynchronous external interrupt pin. See
External Interrupt
The IRQ circuits are powered by the chip V
drive the pin between V
device on IRQ1, the pin must be pulled to V
The OSC1 and OSC2 pins are the connections for the on-chip oscillator
circuit. See
A logic 0 on the RST pin forces the MCU to a known startup state. RST
is bidirectional, allowing a reset of the entire system. It is driven low when
any internal reset source is asserted. See
Interrupts.
The reset circuits are powered by the chip V
drive the pin through a resistor between V
circuits use a pullup device on RST, the pin must be pulled to V
not to BATT.
The IRO pin is the high-current source and sink output of the carrier
modulator transmitter (CMT) subsystem which is suitable for driving
infrared (IR) light-emitting diode (LED) biasing logic. See
Carrier Modulator Transmitter
PTA7–PTA0 are general-purpose bidirectional I/O port pins. See
Section 11. Input/Output Ports
Section 8. Low-Voltage Inhibit
General Description
(IRQ).
DD
and V
SS
(CMT).
(I/O).
levels. If external circuits use a pullup
DD
Section 6. Resets and
DD
DD
DD
(LVI).
and V
. External circuits should
. External circuits should
and not to BATT.
SS
Section 14.
levels. If external
Advance Information
General Description
Section 12.
Pin Functions
DD
and
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