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| 型号： | DM240002 |
| 厂商： | Microchip Technology |
| 文件页数： | 20/42页 |
| 文件大小： | 0K |
| 描述： | BOARD DEV EXPLORER 16 44-PIN |
| 标准包装： | 1 |
| 系列： | Explorer 16 44 引脚 |
| 类型： | MCU |
| 适用于相关产品： | dsPIC30，dsPIC33，PIC32，PIC24FJ，PIC24HJ |
| 所含物品： | Explorer 16 开发板，PIC24FJ64GA004 和 dsPIC33FJ32GP204 PIM 模块 |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
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44-Pin 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 Clears the counter location.
DECFSZ Decrements the location, and if the result is zero, the next instruction is
skipped.
EXAMPLE 3-3:
Short Loop
CLRF
Loop
DECFSZ
GOTO
Long Loop
CLRF
CLRF
Loop
DECFSZ
GOTO
DECFSZ
GOTO
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, (768 + 3) * 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 2.5 Hz rate.
DS41296B-page 16
? 2007 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DM240002 | 制造商:Microchip Technology Inc 功能描述:Explorer 16 kit(44-PIN) w/ PIC24FJ64GA00 |
| DM240011 | 功能描述:开发板和工具包 - PIC / DSPIC MPLAB Starter Kit for PIC24F MCU 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: |
| DM240012 | 功能描述:开发板和工具包 - PIC / DSPIC PIC24E USB Starter Kit 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: |
| DM240013-1 | 功能描述:开发板和工具包 - PIC / DSPIC Microstick for 3V PIC24F K-series 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: |
| DM240013-2 | 功能描述:开发板和工具包 - PIC / DSPIC 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: |
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