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參數(shù)資料
| 型號(hào)： | MB91V280CR |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 32 MHz, RISC MICROCONTROLLER, CPGA401 |
| 封裝： | CERAMIC, PGA-401 |
| 文件頁數(shù)： | 19/85頁 |
| 文件大小： | 1090K |
| 代理商： | MB91V280CR |
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MB91270/280 Series
26
Always connect a resonator of 100 kHz or less on dual clock models.
Treatment of N.C. or OPEN pins
Pins marked as N.C. and OPEN must be left open - circuit.
About Mode pins (MD0 to MD2)
These pins should be connected directly to VCC or VSS. To prevent the device erroneously switching to test mode
due to noise, design the printed circuit board such that the distance between the mode pins and VCC or VSS is
as short as possible and the connection impedance is low.
Operation at start-up
The INITX pin must be held at the “L”level when turning on the power.
Source oscillation input at power on
When turning the power on, maintain clock input until the device is released from the oscillation stabilization
wait state.
Caution on Operations during PLL Clock Mode
Even if the oscillator comes off or the clock input stops with the PLL clock selected for this microcontroller, the
microcontroller may continue to operate at the free-running frequency of the PLL’s internal self-oscillating os-
cillator circuit.
Performance of this operation, however, cannot be guaranteed.
External bus setting
This device is guaranteed for use with a 16 MHz external bus.
If the base clock is set to 32 MHz with DIVR1 (external bus base clock division setting register) set to its initial
value, the external bus also operates at 32 MHz. When changing the base clock, first set the external bus so
that it will not exceed 16 MHz.
Pull-up control
The AC characteristics cannot be guaranteed if pull-up resistors are used for pins used as external bus pins.
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