參數(shù)資料
型號: TMS320C240PQL
英文描述: 16-Bit Microcontroller
中文描述: 16位微控制器
文件頁數(shù): 67/105頁
文件大?。?/td> 1481K
代理商: TMS320C240PQL
TMS320C240, TMS320F240
DSP CONTROLLERS
SPRS042D – OCTOBER 1996 – REVISED NOVEMBER 1998
67
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
CLOCK OPTIONS (CONTINUED)
tr(CO)
tf(CO)
tw(COH)
CLKOUT/IOPC1
XTAL1/CLKIN
tw(COL)
td(CIH–CO)
tf(CI)
tr(CI)
tw(CIL)
tw(CIH)
tc(CO)
tc(CI)
Figure 21. External Divide-by-Two Clock Timings
external reference crystal with PLL-circuit-enabled clock option
The internal oscillator is enabled by connecting OSCBYP to V
DD
and connecting a crystal across XTAL1/CLKIN
and XTAL2 pins as shown in Figure 20. The crystal should be in either fundamental or overtone operation and
parallel resonant, with an effective series resistance of 30 and a power dissipation of 1 mW; it should be
specified at a load capacitance of 20 pF. Note that overtone crystals require an additional tuned-LC circuit.
timings with the PLL circuit enabled
PARAMETER
EXTERNAL REFERENCE
CRYSTAL
MIN
TYP
MAX
UNIT
4 MHz
4
fx
Input clock frequency
6 MHz
6
MHz
8 MHz
8
C1, C2
Load capacitance
10
pF
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