參數(shù)資料
型號: MB91F647APMC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, FLASH, 60 MHz, RISC MICROCONTROLLER, PQFP176
封裝: 24 X 24 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-176
文件頁數(shù): 81/136頁
文件大?。?/td> 4055K
代理商: MB91F647APMC
MB91645A Series
DS07-16911-1E
49
Crystal oscillator circuit
Noise near the X0 and X1 pins may cause the device to malfunction. Design the printed circuit board so that X0,
X1, the crystal oscillator (or ceramic oscillator), and the bypass capacitor to ground are located as close to the
device as possible.
It is strongly recommended that the PC board artwork be designed such that the X0 and X1 pins are surrounded
by ground plane as this is expected to produce stable operation.
If a 32 kHz oscillator is used (X0A, X1A), use the PK2 pin for an input that changes as infrequently as possible.
Furthermore, take steps such as shown in the following figure to prevent the X0A and PK2 wiring from running
parallel to each other.
If 32 kHz oscillation is not used, there are no limitations.
Using an external clock
When using an external clock, the clock signal should be input to the X0 pin only and the X1 should be kept open.
Mode pins (MD0, MD1)
Connect the MD pin (MD0, MD1) directly to VCC or VSS pins. Design the printed circuit board such that the pull-
up/down resistance stays low, as well as the distance between the mode pins and VCC pins or VSS pins is as
short as possible and the connection impedance is low, when the pins are pulled-up/down such as for switching
the pin level and rewriting the Flash memory data. It is because of preventing the device erroneously switching
to test mode due to noise.
X0A
PK2
GND
X0
X1
Open
MB91645A series
Example of Using an External Clock
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