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MC68HC908MR8 Datasheet, PDF (367/372 Pages) Motorola, Inc – Microcontrollers | |||
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register â A circuit that stores a group of bits.
reserved memory location â A memory location that is used only in special factory test modes.
Writing to a reserved location has no effect. Reading a reserved location returns an
unpredictable value.
reset â To force a device to a known condition.
ROM â Read-only memory. A type of memory that can be read but cannot be changed (written).
The contents of ROM must be specified before manufacturing the MCU.
SCI â See serial communication interface module (SCI).
serial â Pertaining to sequential transmission over a single line.
serial communication interface module (SCI) â A module in the M68HC08 Family that
supports asynchronous communication.
serial peripheral interface module (SPI) â A module in the M68HC08 Family that supports
synchronous communication.
set â To change a bit from logic 0 to logic 1; opposite of clear.
shift register â A chain of circuits that can retain the logic levels (logic 1 or logic 0) written to
them and that can shift the logic levels to the right or left through adjacent circuits in the chain.
signed â A binary number notation that accommodates both positive and negative numbers.
The most significant bit is used to indicate whether the number is positive or negative,
normally logic 0 for positive and logic 1 for negative. The other seven bits indicate the
magnitude of the number.
SIM â See system integration module (SIM).
software â Instructions and data that control the operation of a microcontroller.
software interrupt (SWI) â An instruction that causes an interrupt and its associated vector
fetch.
SPI â See serial peripheral interface module (SPI).
stack â A portion of RAM reserved for storage of CPU register contents and subroutine return
addresses.
stack pointer (SP) â A 16-bit register in the CPU08 containing the address of the next available
storage location on the stack.
start bit â A bit that signals the beginning of an asynchronous serial transmission.
MC68HC908MR8 â Rev 4.1
Freescale Semiconductor
Technical Data
367
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