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MC9S12T64 Datasheet, PDF (602/608 Pages) Motorola, Inc – Specification | |||
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Glossary
Freescale Semiconductor, Inc.
polarity â The two opposite logic levels, logic 1 and logic 0, which correspond to two different
voltage levels, VDD and VSS.
polling â Periodically reading a status bit to monitor the condition of a peripheral device.
port â A set of wires for communicating with off-chip devices.
prescaler â A circuit that generates an output signal related to the input signal by a fractional
scale factor such as 1/2, 1/8, 1/10 etc.
program â A set of computer instructions that cause a computer to perform a desired operation
or operations.
program counter (PC) â A 16-bit register in the CPU. The PC register holds the address of the
next instruction or operand that the CPU will use.
pull â An instruction that copies into the accumulator the contents of a stack RAM location. The
stack RAM address is in the stack pointer.
pullup â A transistor in the output of a logic gate that connects the output to the logic 1 voltage
of the power supply.
pulse-width â The amount of time a signal is on as opposed to being in its off state.
pulse-width modulation (PWM) â Controlled variation (modulation) of the pulse width of a
signal with a constant frequency.
push â An instruction that copies the contents of the accumulator to the stack RAM. The stack
RAM address is in the stack pointer.
PWM period â The time required for one complete cycle of a PWM waveform.
RAM â Random access memory. All RAM locations can be read or written by the CPU. The
contents of a RAM memory location remain valid until the CPU writes a different value or
until power is turned off.
RC circuit â A circuit consisting of capacitors and resistors having a defined time constant.
read â To copy the contents of a memory location to the accumulator.
register â A circuit that stores a group of bits.
reserved memory location â Writing to a reserved location has no effect. Reading a reserved
location always returns ZERO.
reset â To force a device to a known condition.
MC9S12T64Revision 1.1.1
Glossary
For More Information On This Product,
Go to: www.freescale.com
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