收藏本站
TMS320C5515
SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
www.ti.com
3.3
3.3.1
Clock Considerations
The system clock, which is used by the CPU and most of the DSP peripherals, is controlled by the system
clock generator. The system clock generator features a software-programmable PLL multiplier and several
dividers. The clock generator accepts an input reference clock from the CLKIN pin or the output clock of
the 32.768-KHz real-time clock (RTC) oscillator. The selection of the input reference clock is based on the
state of the CLK_SEL pin. The CLK_SEL pin is required to be statically tied high or low and cannot
change dynamically after reset.
In addition, the DSP requires a reference clock for USB applications. The USB reference clock is
generated using a dedicated on-chip oscillator with a 12-MHz external crystal connected to the USB_MXI
and USB_MXO pins.
The USB reference clock is not required if the USB peripheral is not being used. To completely disable the
USB oscillator, connect the USB_MXI pin to ground (V SS ) and leave the USB_MXO pin unconnected. The
USB oscillator power pins (USB_V DDOSC and USB_V SSOSC ) should also be connected to ground.
The RTC oscillator generates a clock when a 32.768-KHz crystal is connected to the RTC_XI and
RTC_XO pins. The 32.768-KHz crystal can be disabled if CLKIN is used as the clock source for the DSP.
However, when the RTC oscillator is disabled, the RTC peripheral will not operate and the RTC registers
(I/O address range 1900h – 197Fh) will not be accessible. This includes the RTC power management
register (RTCPMGT) which controls the RTCLKOUT and WAKEUP pins. To disable the RTC oscillator,
connect the RTC_XI pin to CV DDRTC and the RTC_XO pin to ground.
For more information on crystal specifications for the RTC oscillator and the USB oscillator, see
Section 5.4 , External Clock Input From RTC_XI, CLKIN, and USB_MXI Pins .
Clock Configurations After Device Reset
After reset, the on-chip Bootloader programs the system clock generator based on the input clock selected
via the CLK_SEL pin. If CLK_SEL = 0, the Bootloader programs the system clock generator and sets the
system clock to 12.288 MHz (multiply the 32.768-kHz RTC oscillator clock by 375). If CLK_SEL = 1, the
Bootloader bypasses the system clock generator altogether and the system clock is driven by the CLKIN
pin. In this case, the CLKIN frequency is expected to be 11.2896 MHz, 12.0 MHz, or 12.288 MHz. While
the bootloader tries to boot from the USB, the clock generator will be programmed to output approximately
36 MHz.
3.3.1.1
Device Clock Frequency
After the boot process is complete, the user is allowed to re-program the system clock generator to bring
the device up to the desired clock frequency and the desired peripheral clock state (clock gating or not).
The user must adhere to various clock requirements when programming the system clock generator. For
more information, see Section 5.5 , Clock PLLs .
Note: The on-chip Bootloader allows for DSP registers to be configured during the boot process.
However, this feature must not be used to change the output frequency of the system clock generator
during the boot process. Timer0 is also used by the bootloader to allow for 200 ms of BG_CAP settling
time. The bootloader register modification feature must not modify the Timer0 registers.
52
Device Configuration
Submit Documentation Feedback
Product Folder Links: TMS320C5515
Copyright ? 2010–2013, Texas Instruments Incorporated
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
TMDXEXP1808L KIT EXPERIMENTER FOR AM180X
TO263-3EV-VREG BOARD EVAL TO220-3/TO263-3 VREG
TO263-5EV-VREG EVAL BOARD VREG TO220-5/TO263-5
TOOLSTICK-EK KIT TOOL EVAL SYS IN A USB STICK
TPS23757EVM EVALUATION MODULE FOR TPS23757
TPS62230EVM-370 EVAL MODULE FOR TPS62230-370
TRAVELCUBE SURGE SUP 1OUT W/RJ11 DIRECTPLUG
TRAVELER100BT SURGE SUP 2OUT W/RJ11 DIRECTPLUG
相关代理商/技术参数
TMDXEVM5515 制造商:Texas Instruments 功能描述:TMS320C5515 DSP Evaluation Module
TMDXEVM642 制造商:Texas Instruments 功能描述:Tools Development kit For Use
TMDXEVM6424 功能描述:开发板和工具包 - TMS320 C6424 DSP Eval Mod RoHS:否 制造商:Texas Instruments 产品:Experimenter Kits 工具用于评估:F2802x 核心:TMS320 接口类型:UART, USB 工作电源电压:
TMDXEVM6446 制造商:Rochester Electronics LLC 功能描述:DAVINCI EVM BUNDLE W/O EMULATOR - Bulk 制造商:Texas Instruments 功能描述:DAVINCI EVM BUNDLE W/O EMULATOR - Bulk
TMDXEVM6446T 制造商:Texas Instruments 功能描述:DM6446 DIGITAL VIDEO EVALUATION MODULE - Boxed Product (Development Kits)
TMDXEVM6446TS 制造商:Texas Instruments 功能描述:DM6446 DIGITAL VIDEO EVALUATION MODULE - Trays
TMDXEVM6452 功能描述:开发板和工具包 - TMS320 C6452 EVM Evaluation Module RoHS:否 制造商:Texas Instruments 产品:Experimenter Kits 工具用于评估:F2802x 核心:TMS320 接口类型:UART, USB 工作电源电压:
TMDXEVM6455 功能描述:开发板和工具包 - TMS320 C6455 Evaluation Module RoHS:否 制造商:Texas Instruments 产品:Experimenter Kits 工具用于评估:F2802x 核心:TMS320 接口类型:UART, USB 工作电源电压: