Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF HTML

PIC16C505-04I/JW Datasheet(PDF) 10 Page - Microchip Technology

Part No. PIC16C505-04I/JW
Description  14-Pin, 8-Bit CMOS Microcontroller
Download  80 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo 

PIC16C505-04I/JW Datasheet(HTML) 10 Page - Microchip Technology

Zoom Inzoom in Zoom Outzoom out
 10 / 80 page
background image
PIC16C505
DS40192A-page 10
Preliminary
© 1998 Microchip Technology Inc.
3.1
Clocking Scheme/Instruction Cycle
The clock input (OSC1/CLKIN pin) is internally divided
by four to generate four non-overlapping quadrature
clocks namely Q1, Q2, Q3 and Q4. Internally, the
program counter is incremented every Q1, and the
instruction is fetched from program memory and
latched into instruction register in Q4. It is decoded
and executed during the following Q1 through Q4. The
clocks and instruction execution flow is shown in
Figure 3-2 and Example 3-1.
3.2
Instruction Flow/Pipelining
An Instruction Cycle consists of four Q cycles (Q1, Q2,
Q3 and Q4). The instruction fetch and execute are
pipelined such that fetch takes one instruction cycle
while decode and execute takes another instruction
cycle. However, due to the pipelining, each instruction
effectively executes in one cycle. If an instruction
causes the program counter to change (e.g., GOTO)
then two cycles are required to complete the
instruction (Example 3-1).
A fetch cycle begins with the program counter (PC)
incrementing in Q1.
In the execution cycle, the fetched instruction is
latched into the Instruction Register (IR) in cycle Q1.
This instruction is then decoded and executed during
the Q2, Q3, and Q4 cycles. Data memory is read
during Q2 (operand read) and written during Q4
(destination write).
FIGURE 3-2:
CLOCK/INSTRUCTION CYCLE
EXAMPLE 3-1:
INSTRUCTION PIPELINE FLOW
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
OSC1
Q1
Q2
Q3
Q4
PC
PC
PC+1
PC+2
Fetch INST (PC)
Execute INST (PC-1)
Fetch INST (PC+1)
Execute INST (PC)
Fetch INST (PC+2)
Execute INST (PC+1)
Internal
phase
clock
All instructions are single cycle, except for any program branches. These take two cycles since the fetch
instruction is “flushed” from the pipeline while the new instruction is being fetched and then executed.
1. MOVLW 03H
Fetch 1
Execute 1
2. MOVWF PORTB
Fetch 2
Execute 2
3. CALL
SUB_1
Fetch 3
Execute 3
4. BSF
PORTB, BIT1
Fetch 4
Flush
Fetch SUB_1 Execute SUB_1


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
TMP87PM29UCMOS 8-Bit Microcontroller 1 2 3 4 5 MoreToshiba Semiconductor
PIC16LV5XEPROM-Based 8-Bit CMOS Microcontroller Series 1 2 3 4 5 MoreMicrochip Technology
TMP87C841NCMOS 8-BIT MICROCONTROLLER 1 2 3 4 5 MoreToshiba Semiconductor
TMP88CP77FCMOS 8-BIT Microcontroller 1 2 3 4 5 MoreToshiba Semiconductor
TMP87C844NCMOS 8-Bit Microcontroller 1 2 3 4 5 MoreToshiba Semiconductor
P87LPC778CMOS single-chip 8-bit 80C51 microcontroller 128-byte data RAM 8 kB OTP 1 2 3 4 5 MoreNXP Semiconductors
TMP86PM47AUGCMOS 8-Bit Microcontroller 1 2 3 4 5 MoreToshiba Semiconductor
TMP86PM47UCMOS 8-Bit Microcontroller 1 2 3 4 5 MoreToshiba Semiconductor
HM628128LP131072-word x 8-bit High Speed CMOS Static RAM 1 2 3 4 5 MoreHitachi Semiconductor
Z86E22CMOS Z8 OTP MICROCONTROLLER 1 2 3 4 5 MoreZilog, Inc.

Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn