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參數(shù)資料
型號(hào): TMS470R1A384PZQ
廠商: Texas Instruments
文件頁數(shù): 49/62頁
文件大小: 0K
描述: IC RISC MCU 384K FLASH 100-LQFP
標(biāo)準(zhǔn)包裝: 90
系列: TMS470
核心處理器: ARM7
芯體尺寸: 16/32-位
速度: 48MHz
連通性: CAN,C2Slb,I²C,SCI,SPI
外圍設(shè)備: DMA,PWM,WDT
輸入/輸出數(shù): 53
程序存儲(chǔ)器容量: 384KB(384K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 32K x 8
電壓 - 電源 (Vcc/Vdd): 1.71 V ~ 2.05 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 12x10b
振蕩器型: 外部
工作溫度: -40°C ~ 125°C
封裝/外殼: 100-LQFP
包裝: 管件
配用: 296-23003-ND - KIT DEV KICKSTART TMS470
HIGH-END TIMER (HET) TIMINGS
Minimum PWM Output Pulse Width:
Minimum Input Pulses that Can Be Captured:
www.ti.com ......................................................................................................................................................... SPNS110E – AUGUST 2005 – REVISED MAY 2008
This is equal to one high resolution clock period (HRP). The HRP is defined by the 6-bit high resolution prescale
factor (hr), which is user defined, giving prescale factors of 1 to 64, with a linear increment of codes.
Therefore, the minimum PWM output pulse width = HRP(min) = hr(min)/SYSCLK = 1/SYSCLK
For example, for a SYSCLK of 30 MHz, the minimum PWM output pulse width = 1/30 = 33.33ns
The input pulse width must be greater or equal to the low resolution clock period (LRP), i.e., the HET loop (the
HET program must fit within the LRP). The LRP is defined by the 3-bit loop-resolution prescale factor (lr), which
is user defined, with a power of 2 increment of codes. That is, the value of lr can be 1, 2, 4, 8, 16, or 32.
Therefore, the minimum input pulse width = LRP(min) = hr(min) * lr(min)/SYSCLK = 1 * 1/SYSCLK
For example, with a SYSCLK of 30 MHz, the minimum input pulse width = 1 * 1/30 = 33.33 ns
NOTE:
Once the input pulse width is greater than LRP, the resolution of the measurement is
still HRP. (That is, the captured value gives the number of HRP clocks inside the
pulse.)
Abbreviations:
hr = HET high resolution divide rate = 1, 2, 3,...63, 64
lr = HET low resolution divide rate = 1, 2, 4, 8, 16, 32
High resolution clock period = HRP = hr/SYSCLK
Loop resolution clock period = LRP = hr*lr/SYSCLK
Copyright 2005–2008, Texas Instruments Incorporated
53
Product Folder Link(s): TMS470R1A384
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