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| 型号： | TMDXBDKFP5515 |
| 厂商： | Texas Instruments |
| 文件页数： | 16/159页 |
| 文件大小： | 0K |
| 描述： | KIT DEV FINGERPRINT C5515 |
| 标准包装： | 1 |
| 传感器类型： | 指纹 |
| 接口： | USB |
| 电源电压： | 5V |
| 嵌入式： | 是，MCU，16 位 |
| 已供物品： | 板，扩展板，线缆，迷你型 DVD，传感器 |
| 已用 IC / 零件： | C5515 |
| 产品目录页面： | 718 (CN2011-ZH PDF) |
| 其它名称： | 296-27452 |
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SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
2.5.1
Oscillator and PLL Terminal Functions
Table 2-5. Oscillator and PLL Terminal Functions
SIGNAL
NAME
NO.
TYPE (1)
(2)
OTHER (3)
(4)
DESCRIPTION
DSP clock output signal. For debug purposes, the CLKOUT pin can be used to tap
different clocks within the system clock generator. The SRC bits in the CLKOUT
Control Source Register (CCSSR) can be used to specify the CLKOUT pin source.
Additionally, the slew rate of the CLKOUT pin can be controlled by the Output
Slew Rate Control Register (OSRCR) [0x1C16].
–
The CLKOUT pin is enabled/disabled through the CLKOFF bit in the CPU ST3_55
CLKOUT
A7
O/Z
DV DDIO
register. When disabled, the CLKOUT pin is placed in high-impedance (Hi-Z). At
BH
reset the CLKOUT pin is enabled until the beginning of the boot sequence, when
the on-chip Bootloader sets CLKOFF = 1 and the CLKOUT pin is disabled (Hi-Z).
For more information on the ST3_55 register, see the TMS320C55x 3.0 CPU
Reference Guide (literature number: SWPU073 ).
Note: This pin may consume static power if configured as Hi-Z and not pulled high
or low. Prevent current drain by externally terminating the pin.
Input clock. This signal is used to input an external clock when the 32-KHz on-chip
oscillator is not used as the DSP clock (pin CLK_SEL = 1). For boot purposes, the
CLKIN frequency is assumed to be either 11.2896, 12, or 12.288 MHz.
The CLK_SEL pin (C7) selects between the 32-KHz crystal clock or CLKIN.
CLKIN
A8
I
–
DV DDIO
BH
When the CLK_SEL pin is low, this pin should be tied to ground (V SS ). When
CLK_SEL is high, this pin should be driven by an external clock source.
If CLK_SEL is high, this pin is used as the reference clock for the clock generator
and during bootup the bootloader bypasses the PLL and assumes the CLKIN
frequency is one of the following frequencies: 11.2896-, 12-, or 12.288-MHz. With
these frequencies in mind, the bootloader sets the SPI clock rates at 500 KHz and
the I2C clock rate at 400 KHz.
Clock input select. This pin selects between the 32-KHz crystal clock or CLKIN.
0 = 32-KHz on-chip oscillator drives the RTC timer and the system clock generator
–
while CLKIN is ignored.
CLK_SEL
C7
I
DV DDIO
BH
1 = CLKIN drives the system clock generator and the 32-KHz on-chip oscillator
drives only the RTC timer.
This pin is not allowed to change during device operation; it must be tied high or
low at the board.
1.3-V Analog PLL power supply for the system clock generator (PLLOUT ≤ 120
V DDA_PLL
C10
PWR
see Section 4.2 , MHz).
ROC
This signal can be powered from the ANA_LDOO pin.
V SSA_PLL
D9
GND
ROC
Analog PLL ground for the system clock generator.
(1)
(2)
(3)
(4)
I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal, BH = Bus Holder
Input pins of type I, I/O, and I/O/Z are required to be driven at all times. To achieve the lowest power, these pins must not be allowed to
float. When they are configured as input or high-impedance state, and not driven to a known state, they may cause an excessive IO-
supply current. Prevent this current by externally terminating it or enabling IPD/IPU, if applicable.
IPD = Internal pulldown, IPU = Internal pullup. For more detailed information on pullup/pulldown resistors and situations where external
pullup/pulldown resistors are required, see Section 3.8.1 , Pullup/Pulldown Resistors .
Specifies the operating I/O supply voltage for each signal
16
Device Overview
Product Folder Links: TMS320C5515
Copyright ? 2010–2013, Texas Instruments Incorporated
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