mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 97

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

4.10.1 Microsequencer
4.10.2 Instruction Pipeline
4.10.3 Execution Unit
MC68HC16Y3/916Y3
USER’S MANUAL
The microsequencer controls the order in which instructions are fetched, advanced
through the pipeline, and executed. It increments the program counter and generates
multiplexed external tracking signals IPIPE0 and IPIPE1 from internal signals that
control execution sequence.
The pipeline is a three stage first in, first out buffer (FIFO) that holds instructions while
they are decoded and executed. Depending upon instruction size, as many as three
instructions can be in the pipeline at one time (single-word instructions, one held in
stage C, one being executed in stage B, and one latched in stage A).
The execution unit evaluates opcodes, interfaces with the microsequencer to advance
instructions through the pipeline, and performs instruction operations.
IPIPE0
IPIPE1
DATA
BUS
Figure 4-5 Instruction Execution Model
Freescale Semiconductor, Inc.
For More Information On This Product,
A
Go to: www.freescale.com
INSTRUCTION PIPELINE
MICROSEQUENCER
EXECUTION UNIT
B
C
16 EXEC UNIT MODEL
MOTOROLA
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