XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 567

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

exception — An event such as an interrupt or a reset that stops the sequential execution of the
external interrupt module (IRQ) — A module in the M68HC08 Family with both dedicated
fetch — To copy data from a memory location into the accumulator.
firmware — Instructions and data programmed into nonvolatile memory.
free-running counter — A device that counts from zero to a predetermined number, then rolls
full-duplex transmission — Communication on a channel in which data can be sent and
H — The upper byte of the 16-bit index register (H:X) in the CPU08.
H — The half-carry bit in the condition code register of the CPU08. This bit indicates a carry from
hexadecimal — Base 16 numbering system that uses the digits 0 through 9 and the letters A
high byte — The most significant eight bits of a word.
illegal address — An address not within the memory map
illegal opcode — A nonexistent opcode.
I — The interrupt mask bit in the condition code register of the CPU08. When I is set, all interrupts
index register (H:X) — A 16-bit register in the CPU08. The upper byte of H:X is called H. The
MC68HC908AZ60A — Rev 2.0
MOTOROLA
instructions in the main program.
external interrupt pins and port pins that can be enabled as interrupt pins.
over to zero and begins counting again.
received simultaneously.
the low-order four bits of the accumulator value to the high-order four bits. The half-carry
bit is required for binary-coded decimal arithmetic operations. The decimal adjust
accumulator (DAA) instruction uses the state of the H and C bits to determine the
appropriate correction factor.
through F.
are disabled.
lower byte is called X. In the indexed addressing modes, the CPU uses the contents of
H:X to determine the effective address of the operand. H:X can also serve as a temporary
data storage location.
Glossary
Technical Data
Glossary
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