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| 型号： | DM164120-1 |
| 厂商： | Microchip Technology |
| 文件页数： | 20/42页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO PICKIT 2 LP COUNT |
| 标准包装： | 1 |
| 系列： | PICkit™ |
| 类型： | MCU |
| 适用于相关产品： | 28 引脚 PIC16C、16F、18C、18F |
| 所含物品： | 3 个板（1 个装有元件的板，2 个裸板） |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
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Low Pin Count Demo Board User’s Guide
Increment or Decrement a File Register
The INCFSZ and DECFSZ instructions add or subtract one from the contents of
the file register and skips the next instruction when the result is zero. One use is
CLRF
DECFSZ
EXAMPLE 3-3:
Short Loop
CLRF
Loop
DECFSZ
GOTO
Long Loop
CLRF
CLRF
Loop
DECFSZ
GOTO
DECFSZ
GOTO
Clears the counter location.
Decrements the location, and if the result is zero, the next
instruction is skipped.
DELAY LOOP
Delay
Delay,f
Loop
Delay1
Delay2
Delay1,f
Loop
Delay2,f
Loop
The GOTO Loop (in Example 3-3) backs up and does it again. This loop takes 3
instruction times; one for the decrement and two for the GOTO (see note) and the
counter will force it to go around 256 times, which takes it a total of 768 instruction times
(768 μ s) to execute.
Even that is still too fast for the eye to see. It can be slowed down even more by adding
a second loop around this one.
The inner loop still takes 768 μ s plus 3 for the outer loop, but now it’s executed another
256 times, 771 * 256 = 197376 μ s = 0.197s.
Note:
GOTO instructions take two instructions due to the pipelined design of the
processor. The processor fetches the next instruction while executing the
current instruction. When a program branch occurs, the fetched instruction
is not executed.
Open Blink.asm and build the lesson. Next, import the hex file into the PICkit 2 and
program the device. Note the LED now flashes at about a 2 Hz rate.
DS51556A-page 16
? 2005 Microchip Technology Inc.
相关PDF资料 |
PDF描述 |
|---|---|
| DM164120-3 | BOARD DEMO PICKIT2 28-PIN |
| DM164120-5 | BOARD DEMO PICKIT 2 64/80-PIN |
| DM164123 | KIT MANAGEMENT SYSTEM PICDEM |
| DM180021 | KIT STARTER MPLAB FOR PIC18F MCU |
| DM183022 | BOARD DEMO PIC18FXX22 64/80TQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DM164120-1 | 制造商:Microchip Technology Inc 功能描述:DEVELOPMENT TOOLS - PICKIT 2 LOW PIN COU |
| DM164120-2 | 功能描述:开发板和工具包 - PIC / DSPIC PICkit 2 44-Pin Count Demo Brd RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM164120-3 | 功能描述:开发板和工具包 - PIC / DSPIC PICkit 2 Count Demo Board RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM164120-4 | 功能描述:开发板和工具包 - PIC / DSPIC PICkit 2 1 Dem Board RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM164120-4 | 制造商:Microchip Technology Inc 功能描述:PICkit 2 18-Pin Demo Board |
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