參數(shù)資料
型號: SAX-XC878CM-13FFI5V
廠商: INFINEON TECHNOLOGIES AG
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 24 MHz, RISC MICROCONTROLLER, PQFP64
封裝: PLASTIC, TQFP-64
文件頁數(shù): 123/141頁
文件大小: 2385K
代理商: SAX-XC878CM-13FFI5V
XC878CLM
Functional Description
Data Sheet
75
V1.1, 2009-08
resistance method. Oscillation measurement with the final target system is strongly
recommended to verify the input amplitude at XTAL1 and to determine the actual
oscillation allowance (margin negative resistance) for the oscillator-crystal system.
When using an external clock signal, the signal must be connected to XTAL1. XTAL2 is
left open (unconnected).
The oscillator can also be used in combination with a ceramic resonator. The final
circuitry must also be verified by the resonator vendor. Figure 20 shows the
recommended external oscillator circuitries for both operating modes, external crystal
mode and external input clock mode.
Figure 20
External Oscillator Circuitry
Note: For crystal operation, it is strongly recommended to measure the negative
resistance in the final target system (layout) to determine the optimum parameters
for the oscillator operation. Please refer to the minimum and maximum values of
the negative resistance specified by the crystal supplier.
XC878
Oscillator
VSS
C
X1
2 - 20
MHz
C
X2
XTAL1
XTAL2
XC878
Oscillator
XTAL1
XTAL2
External Clock
Signal
f
OSC
f
OSC
Fundamental
Mode Crystal
RX2
RQ
VSS
Rf
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