PIC17LC752-08/JWQTP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC17LC752-08/JWQTP

High-Performance 8-Bit CMOS EPROM Microcontrollers

Microchip Technology 

PIC17C75X

18.2 Q Cycle Activity

Each instruction cycle (Tcy) is comprised of four Q

cycles (Q1-Q4). The Q cycle is the same as the device

oscillator cycle (TOSC). The Q cycles provide the tim-

ing/designation for the Decode, Read, Process Data,

Write etc., of each instruction cycle. The following dia-

gram shows the relationship of the Q cycles to the

instruction cycle.

The four Q cycles that make up an instruction cycle

(Tcy) can be generalized as:

Q1: Instruction Decode Cycle or forced No

operation

Q2: Instruction Read Cycle or No operation

Q3: Process the Data

Q4: Instruction Write Cycle or No operation

Each instruction will show the detailed Q cycle opera-

tion for the instruction.

FIGURE 18-2: Q CYCLE ACTIVITY

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Tosc

Tcy1

Tcy2

Tcy3

© 1997 Microchip Technology Inc.

DS30264A-page 185

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