mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 392

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Glossary
Advance Information
392
binary number system — The base 2 number system, having two
bit — A binary digit. A bit has a value of either logic 0 or logic 1.
branch instruction — An instruction that causes the CPU to continue
break interrupt — A software interrupt caused by the appearance on
break module — A module in the M68HC08 Family. The break module
breakpoint — A number written into the break address registers of the
bus — A set of wires that transfers logic signals.
bus clocks — There are two bus clocks, IT12 and IT23. These clocks
byte — A set of eight bits.
C — The carry/borrow bit in the condition code register. The CPU08 sets
CCR — See condition code register.
digits, 0 and 1. Binary arithmetic is convenient in digital circuit design
because digital circuits have two permissible voltage levels, low and
high. The binary digits 0 and 1 can be interpreted to correspond to
the two digital voltage levels.
processing at a memory location other than the next sequential
address.
the internal address bus of the same value that is written in the break
address registers.
allows software to halt program execution at a programmable point
to enter a background routine.
break module. When a number appears on the internal address bus
that is the same as the number in the break address registers, the
CPU executes the software interrupt instruction (SWI).
are generated by the CGM and distributed throughout the MCU by
the SIM. The frequency of the bus clocks, or operating frequency, is
f
is different.
the carry/borrow bit when an addition operation produces a carry out
of bit 7 of the accumulator or when a subtraction operation requires
a borrow. Some logical operations and data manipulation instructions
also clear or set the carry/borrow bit (as in bit test and branch
instructions and shifts and rotates).
OP
. While the frequency of these two clocks is the same, the phase
Glossary
MC68HC908MR24
MOTOROLA
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Rev. 4.0