参数资料
型号: TMDXCNCD28069ISO
厂商: Texas Instruments
文件页数: 123/174页
文件大小: 0K
描述: EVAL PICCOLO CONTROLCARD
标准包装: 1
系列: TMS320F2806x, Piccolo™, C2000™
主要目的: 接口,RS232,GPIO
嵌入式: 是,MCU,32 位
已用 IC / 零件: TMS320F2806x
已供物品:
SPRS698D – NOVEMBER 2010 – REVISED DECEMBER 2012
2.9.4
USB and HRCAP PLL Module (PLL2)
In addition to the main system PLL, these devices also contain a second PLL (PLL2) which can be used to
clock the USB and HRCAP peripherals. The PLL supports multipliers of 1 to 15 and has a fixed divide-by-
two on its output.
PLL2 may be clocked from the following three sources by modifying the PLL2CLKSRCSEL bits
appropriately in the PLL2CTL register:
INTOSC1 (Internal Zero-pin Oscillator 1): This is the on-chip internal oscillator 1 and provides a 10-
MHz clock. If used as a clock source for HRCAP, the oscillator compensation routine should be called
frequently. Because of accuracy requirements, INTOSC1 cannot be used as a clock source for the
USB.
Crystal/Resonator Operation: The (crystal) oscillator enables the use of an external crystal or resonator
attached to the device to provide the time base. The crystal or resonator is connected to the X1/X2
pins.
External Clock Source Operation: This mode allows the reference clock to be derived from an external
single-ended clock source connected to either GPIO19 or GPIO38. The XCLKINSEL bit in the XCLK
register should be set appropriately to enable the selected GPIO to drive XCLKIN.
NOTE
For proper operation of the USB module, PLL2 should be configured to generate a 120-MHz
clock. This will be divided by two to yield the desired 60 MHz for the USB peripheral.
HRCAP supports a maximum clock input frequency of 120 MHz.
52
Device Overview
Copyright 2010–2012, Texas Instruments Incorporated
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