參數(shù)資料
型號(hào): DSP56321VF275
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
元件分類: 數(shù)字信號(hào)處理
英文描述: 24-Bit Digital Signal Processor
中文描述: 24位數(shù)字信號(hào)處理器
文件頁(yè)數(shù): 47/84頁(yè)
文件大小: 898K
代理商: DSP56321VF275
AC Electrical Characteristics
DSP56321 Technical Data, Rev. 11
Freescale Semiconductor
2-27
2.4.10 Considerations For GPIO Use
The following considerations can be helpful when GPIO is used.
2.4.10.1 GPIO as Output
The time from fetch of the instruction that changes the GPIO pin to the actual change is seven core clock
cycles, if the instruction is a on
e
-cycle instruction and there are no pipeline stalls or any other pipeline
delays.
The maximum rise or fall time of a GPIO pin is 13 ns (TTL levels, assuming that the maximum of 50 pF
load limit is met).
2.4.10.2 GPIO as Input
GPIO inputs are not synchronized with the core clock. When only one GPIO bit is polled, this lack of
synchronization presents no problem, since the read value can be either the previous value or the new value of the
corresponding GPIO pin. However, there is the risk of reading an intermediate state if:
Two or more GPIO bits are treated as a coupled group (for example, four possible status states encoded in
two bits).
The read operation occurs during a simultaneous change of GPIO pins (for example, the change of 00 to 11
may happen through an intermediate state of 01 or 10).
Therefore, when GPIO bits are read, the recommended practice is to poll continuously until two consecutive read
operations have identical results.
Figure 2-26.
TIO Timer Event Input Restrictions
Figure 2-27.
Timer Interrupt Generation
TIO
481
480
TIO (Input)
First Interrupt Instruction Execution
Address
486
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DSP56321VL200R2 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC 24 BIT DSP PBFREE RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
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