參數(shù)資料
型號(hào)： MB91F158PMC1
廠商： FUJITSU LTD
元件分類(lèi)： 微控制器/微處理器
英文描述： RISC MICROCONTROLLER, PQFP120
封裝： 14 X 14 MM, 1.70 MM HEIGHT, 0.40 MM PITCH, PLASTIC, LQFP-120
文件頁(yè)數(shù)： 5/92頁(yè)
文件大?。?/td> 2193K
代理商： MB91F158PMC1
MB91F158 Series
DS07-16316-2E
13
The following figure shows an example usage of an external clock.
Figure 3.1 An example usage of an external clock
Care during operating of PLL clock mode
If the PLL clock mode is selected, the microcontroller attempt to be working with the self-oscillating circuit even
when there is no external oscillator or external clock input is stopped. Performance of this operation, however,
cannot be guaranteed.
Watchdog timer function
The watchdog timer supported by the FR family monitors the program that performs the reset delay operation
for a specified time. If the program hangs and the reset delay operation is not performed, the watchdog timer
resets the CPU. Therefore, once the watchdog timer is enabled, operation continues until the CPU is reset.
As an exception, a reset delay automatically occurs if the CPU stops program execution. For the conditions
that apply to this exception, refer to the section that describes the watchdog function.
4.
Care during Powering Up
When powering up
When turning on the power supply, never fail to start from setting the RST pin to “L” level. And after the power
supply voltage goes to VCC level, at least after ensuring the time for 5 machine cycle, then set to “H” level.
Source oscillation input
At turning on the power supply, never fail to input the clock before cancellation of the oscillation stabilizing
waiting.
Power on resetting
When powering up or when turning the power back on after the supply voltage drops below the operation
assurance range, be sure to reset the power.
Power on sequence
Turn on the power in the order of VCC, AVCC and AVRH. The power should be disconnected in inverse order.
Even when an A/D converter is not in use, connect AVCC to the VCC level and AVSS to the VSS level.
Even when a D/A converter is not in use, connect DAVC to the VCC level and DAVS to the VSS level.
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MB91F158 series
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