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| 型号： | DV164101 |
| 厂商： | Microchip Technology |
| 文件页数： | 64/76页 |
| 文件大小： | 0K |
| 描述： | KIT DEV PICKIT1 FLASH 8/14PIN |
| 产品培训模块： | Asynchronous Stimulus |
| 标准包装： | 1 |
| 系列： | PICkit™ 1 |
| 类型： | MCU |
| 适用于相关产品： | Microchip 8-14 引脚闪存微控制器 |
| 所含物品： | PIC 套件 1 电路板、光盘、USB 接口缆线和手册 |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
| 配用： | AC164122-ND - BOARD DAUGHT PICTAIL SD/MMC CARD AC164120-ND - BOARD SIGNAL ANALYSIS PICKIT |
| 其它名称： | DV164101R DV164101R-ND |
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PICkit ? 1 Flash Starter Kit User’s Guide
C.7
LESSON 5 – PROGRAM MEMORY LOOK-UP ROUTINES
There is often a need to store constants or strings in a PIC microcontroller. Storing this
information in program memory is the best solution as long as this data never needs to
change and program memory is available. Program memory is non-volatile, therefore,
it will maintain information regardless of V DD voltage levels or PIC microcontroller reset.
This lesson demonstrates how to retrieve data from Program Memory. It covers the
following topics:
? What a program memory look-up table is
? How a program memory look-up table is implemented
? Why a program memory look-up table is useful
C.7.1
Design
Constants stored in program memory are accessed via look-up tables. A look-up table
is similar to a computed goto (see Lesson 2 ) only instead of a list of goto statements,
after incrementing the program counter, there is a list of retlw instructions. Each
retlw instruction is followed by one byte of the information. Example C-3 shows a
look-up table for the string “Microchip” written in assembly language.
EXAMPLE C-3:
LOOK-UP TABLE WRITTEN IN ASSEMBLY
LookupProgramMemory
movlw high StartTable
movwf PCLATH
movlw low StartTable
addwf index, w
btfsc STATUS, C
incf PCLATH, f
movwf PCL
StartTable
retlw
retlw
retlw
retlw
retlw
retlw
retlw
retlw
retlw
" M "
" i "
"c"
"r"
"o"
"c"
"h"
"i"
"p"
For this lesson, constants corresponding to a sequence of LEDs are stored in a
program memory look-up table. For instance, the first constant stored is 5F. This
corresponds to the binary number “ 01011111 ”. Each bit corresponds to an LED,
therefore, LEDs D0, D1, D2, D3, D4 and D6 will be lit when this constant is accessed.
After each look-up table, the value is displayed on the LEDs in the same fashion as
discussed in Lesson 3 , using the Timer0 interrupt. The appearance of more than one
LED being lit at a time is possible because the LEDs are multiplexed fast enough that
the human eye can not detect the LEDs being turned on and off. When SW1 is pressed,
an interrupt-on-change is generated to increment the lookup to the next location.
DS40051D-page 60
? 2004 Microchip Technology Inc.
相关PDF资料 |
PDF描述 |
|---|---|
| DV164120 | KIT STARTER PICKIT 2 |
| DV164121 | KIT PICKIT 2 DEBUG EXPRESS |
| DV164122 | ANALYZER SRL PICKIT W/DEMO BOARD |
| DV164131 | KIT STARTER PICKIT 3 |
| DV164132 | KIT EVAL F1 FOR PIC12F1/PIC16F1 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DV164101 | 制造商:Microchip Technology Inc 功能描述:TOOLS: FLASH MICROCONTROLLER ( |
| DV164102 | 功能描述:开发板和工具包 - 无线 rfPICkit RoHS:否 制造商:Arduino 产品:Evaluation Boards 工具用于评估:AT32UC3L 核心:AVR32 频率: 接口类型:USB 工作电源电压:5 V |
| DV164120 | 功能描述:电路内置调试器 PICkit 2 8/14/20P Flash RoHS:否 制造商:Microchip Technology 产品:In-Circuit Debugger Kits 工具用于评估:PIC MCUs, dsPIC DSCs 用于:07-00024, AC164113 核心:dsPIC, PIC 接口类型:USB 工作电源电压:3 V to 5 V |
| DV164121 | 功能描述:电路内置调试器 PICkit 2 Debug Express RoHS:否 制造商:Microchip Technology 产品:In-Circuit Debugger Kits 工具用于评估:PIC MCUs, dsPIC DSCs 用于:07-00024, AC164113 核心:dsPIC, PIC 接口类型:USB 工作电源电压:3 V to 5 V |
| DV164121 | 制造商:Microchip Technology Inc 功能描述:ICPICKIT2 PROGRAMMER/DEBUGGER ((NW)) |
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