MC68HC05T16
MOTOROLA
2-1
PIN DESCRIPTIONS AND INPUT/OUTPUT PORTS
2
2
PIN DESCRIPTIONS AND
INPUT/OUTPUT PORTS
This section provides a description of the functional pins and I/O programming of the
MC68HC05T16/
MC68HC705T16 microcontroller.
2.1
PIN DESCRIPTIONS
PIN NAME
56-pin SDIP
PIN No.
DESCRIPTION
VDD, VSS
41, 44
Power is supplied to the MCU using these two pins. VDD is power and
VSS is ground.
IRQ/VPP
38
In the user mode this pin is an external hardware interrupt IRQ. It is
software programmable to provide two choices of interrupt triggering
sensitivity. These options are:
1) negative edge-sensitive triggering only, or
2) both negative edge-sensitive and level sensitive triggering.
In the bootstrap mode on the MC68HC705T16, this is the EPROM
programming voltage input pin.
RESET
53
The active low RESET input is not required for start-up, but can be
used to reset the MCU internal state and provide an orderly software
start-up procedure.
TCAP
15
The TCAP input controls the input capture feature for the on-chip
programmable free-running timer.
EXTAL, XTAL
51, 52
These pins provide connections to the on-chip oscillator. The
maximum crystal frequency is 4.2 MHz. EXTAL may be driven by an
external oscillator if an external crystal circuit is not used.
PA0-PA7
31-24
These eight I/O lines comprise port A. The state of any pin is software
programmable. All port A lines are configured as input during power
on or external reset.
PB0-PB7
16-23
These eight I/O lines comprise port B. The state of any pin is software
programmable. All port B lines are configured as input during power
on or external reset. These pins are +12V open-drain pins.
TPG
19
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