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参数资料
| 型号： | MB91661PMC |
| 厂商： | FUJITSU LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, MROM, 33 MHz, RISC MICROCONTROLLER, PQFP120 |
| 封装： | 16 X 16 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-120 |
| 文件页数： | 59/128页 |
| 文件大小： | 3660K |
| 代理商： | MB91661PMC |
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MB91660 Series
36
DS07-16905-4E
Using an external clock
When using an external clock, the clock signal should be input to the X0 pin only and the X1 pin should be kept
open.
C Pin
As MB91660 series includes an internal regulator, always connect a bypass capacitor of approximately 4.7
μF
to the C pin for use by the regulator.
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.
Notes on power-on
To ensure that the internal regulator and the oscillator have stabilized immediately after the power is turned
on, keep an “L” level input connected to the INIT pin for the duration of the regulator voltage stabilization wait
time + the oscillator start time of the oscillator + the main oscillator stabilization wait time.
Turn power on/off in the following order
Turning on : VCC
→ AVCC → AVRH
Turning off : AVRH
→ AVCC → VCC
Release the reset (INIT pin “L” level to “H” level) after the power supply has stabilized.
Caution on operations during PLL clock mode
On this microcontroller, if in case the crystal oscillator breaks off or an external reference clock input stops while
the PLL clock mode is selected, a self-oscillator circuit contained in the PLL may continue its operation at its
self-running frequency.
However, Fujitsu will not guarantee results of operations if such failure occurs.
Example of Using an External Clock
X0
X1
Open
MB91660
series
C
4.7 F
GND
VSS
MB91660
series
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