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參數(shù)資料
| 型號： | TMS470R1B768PGEQR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, FLASH, 60 MHz, RISC MICROCONTROLLER, PQFP144 |
| 封裝： | PLASTIC, LQFP-144 |
| 文件頁數(shù)： | 36/49頁 |
| 文件大?。?/td> | 552K |
| 代理商： | TMS470R1B768PGEQR |
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HIGH-END TIMER (HET) TIMINGS
Minimum PWM Output Pulse Width:
Minimum Input Pulses that Can Be Captured:
HIGH-END CAN CONTROLLER (HECCn) MODE TIMINGS
Dynamic Characteristics for the CANnHTX and CANnHRX Pins
www.ti.com ......................................................................................................................................................... SPNS108B – 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
PARAMETER
MIN
MAX
UNIT
td(CANnHTX)
Delay time, transmit shift register to CANnHTX pin(1)
15
ns
td(CANnHRX)
Delay time, CANnHRX pin to receive shift register
5
ns
(1)
These values do not include rise/fall times of the output buffer.
Copyright 2005–2008, Texas Instruments Incorporated
41
Product Folder Link(s): TMS470R1B768
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| TMS470R1B768PGET | 功能描述:ARM微控制器 - MCU 60mhz / 768k Flash RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風格:SMD/SMT |
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