參數(shù)資料
型號(hào)： TMS320F2801ZGMQ
廠商： Texas Instruments, Inc.
元件分類： 數(shù)字信號(hào)處理
英文描述： Digital Signal Processors
中文描述： 數(shù)字信號(hào)處理器
文件頁數(shù)： 94/123頁
文件大小： 1205K
代理商： TMS320F2801ZGMQ
www.ti.com
6.8.2
GPIO - Input Timing
#!
Sampling Window
('%('
&$"
(! &
)!
(A)
GPxQSELn = 1,1 (6 samples)
Sampling Period determined
by GPxCTRL[QUALPRD]
(B)
(D)
t
w(IQSW)
t
w(SP)
TMS320F2808, TMS320F2806
TMS320F2801, UCD9501
Digital Signal Processors
SPRS230F–OCTOBER 2003–REVISED SEPTEMBER 2005
A.
This glitch will be ignored by the input qualifier. The QUALPRD bit field specifies the qualification sampling period. It
can vary from 00 to 0xFF. If QUALPRD = 00, then the sampling period is 1 SYSCLKOUT cycle. For any other value
"n", the qualification sampling period in 2n SYSCLKOUT cycles (i.e., at every 2n SYSCLKOUT cycles, the GPIO pin
will be sampled)..
The qualification period selected via the GPxCTRL register applies to groups of 8 GPIO pins.
The qualification block can take either three or six samples. The GPxQSELn Register selects which sample mode is
used.
In the example shown, for the qualifier to detect the change, the input should be stable for 10 SYSCLKOUT cycles or
greater. In other words, the inputs should be stable for (5 x QUALPRD x 2) SYSCLKOUT cycles. This would ensure 5
sampling periods for detection to occur. Since external signals are driven asynchronously, an 13-SYSCLKOUT-wide
pulse ensures reliable recognition.
B.
C.
D.
Figure 6-9. Sampling Mode
Table 6-13. General-Purpose Input Timing Requirements
MIN
MAX
UNIT
cycles
cycles
cycles
cycles
cycles
QUALPRD = 0
QUALPRD
≠
0
1t
c(SCO)
t
w(SP)
Sampling period
2t
c(SCO)
* QUALPRD
t
w(SP)
* (n
(1)
- 1)
t
w(IQSW)
Input qualifier sampling window
Synchronous mode
With input qualifier
2t
c(SCO)
t
w(GPI)(2)
Pulse duration, GPIO low/high
t
w(IQSW)
+ t
w(SP)
+ 1t
c(SCO)
(1)
(2)
"n" represents the number of qualification samples as defined by GPxQSELn register.
For t
w(GPI)
, pulse width is measured from V
IL
to V
IL
for an active low signal and V
IH
to V
IH
for an active high signal.
6.8.3
Sampling Window Width for Input Signals
The following section summarizes the sampling window width for input signals for various input qualifier
configurations.
Sampling frequency denotes how often a signal is sampled with respect to SYSCLKOUT.
Sampling frequency = SYSCLKOUT/(2 * QUALPRD), if QUALPRD
≠
0
Sampling frequency = SYSCLKOUT, if QUALPRD = 0
Sampling period = SYSCLKOUT cycle x 2 x QUALPRD, if QUALPRD
≠
0
In the above equations, SYSCLKOUT cycle indicates the time period of SYSCLKOUT.
94
Electrical Specifications
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參數(shù)描述
TMS320F2801ZGMS 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC 32-Bit Digital Sig Controller w/Flash 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
TMS320F280200DAS 功能描述:32位微控制器 - MCU Piccolo Micro controller RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:90 MHz 程序存儲(chǔ)器大小:64 KB 數(shù)據(jù) RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風(fēng)格:SMD/SMT
TMS320F280200DAT 功能描述:32位微控制器 - MCU Piccolo Micro controller RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:90 MHz 程序存儲(chǔ)器大小:64 KB 數(shù)據(jù) RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風(fēng)格:SMD/SMT
TMS320F280200PTS 功能描述:32位微控制器 - MCU Piccolo Micro controller RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:90 MHz 程序存儲(chǔ)器大小:64 KB 數(shù)據(jù) RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風(fēng)格:SMD/SMT
TMS320F280200PTT 功能描述:32位微控制器 - MCU Piccolo Micro controller RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:90 MHz 程序存儲(chǔ)器大小:64 KB 數(shù)據(jù) RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風(fēng)格:SMD/SMT
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