參數(shù)資料
型號： MB91F725RPMC-GSE1
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： RISC MICROCONTROLLER, PQFP144
封裝： 20 X 20 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, PLASTIC, LQFP-144
文件頁數(shù)： 46/120頁
文件大?。?/td> 4549K
代理商： MB91F725RPMC-GSE1
MB91725 Series
DS07-16914-1E
31
Treatment of C pin
This device contains a voltage step-down circuit. A capacitor must always be connected to the C pin to assure
the internal stabilization of the device. For the value, see the "2. Recommended Operating Conditions" of
"
■ ELECTRICAL CHARACTERISTICS".
Serial communication
There is a possibility to receive wrong data due to noise or other causes on the serial communication. Therefore,
design a printed circuit board so as to avoid noise.
Consider receiving of wrong data when designing the system. For example, apply a checksum to detect an error.
If an error is detected, retransmit the data.
Function Switching of a Multiplexed Port
To switch between the port function and the multiplexed pin function, use the PFR (port function register).
However, if a pin is also used for an external bus, its function is switched by the external bus setting. For details,
see "I/O PORTS" in Hardware Manual.
Even if an external bus is used, some resource pins can be used by the EPFR (extended port function register)
setting.
Low-power Consumption Mode
To transit to the sleep mode, watch mode, or stop mode, follow the procedure explained in the "Operation" of
"POWER CONSUMPTION CONTROL" in Hardware Manual.
Do not perform the following when using a monitor debugger.
- Do not set a break point for the low-power consumption transition program.
- Do not execute an operation step for the low-power consumption transition program.
Notes When Writing Data in a Register Having the Status Flag
When writing data in the register including a status flag (especially, an interrupt request flag) in order to control
function take care not to clear its status flag erroneously.
The program must be written not to clear the flag to the status bit, and to set the control bits to have the desired
value.
Especially, if multiple control bits are used, the bit instruction cannot be used. (The bit instruction can access to
a single bit only.) The byte, half-word, or word access must be used to write data in the control bits and status
flag simultaneously. During this time, take care not to clear other bits (in this case, the bits of status flag)
erroneously.
Note: These points can be ignored because the bit instructions are already taken the points into consideration.
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