When we try to carry out the Nuvoton Microcontroller W77E058A Flash Memory Breaking, the electro-magnetic interference effect could be a problem for this process, Because of on-chip Flash EPROM, when a program is running in internal ROM space, the ALE will be unused.

The transition of ALE will cause noise, so it can be turned off to reduce the EMI emission if it is useless. Turning off the ALE signal transition only requires setting the bit 0 of the AUXR SFR, which is located at 08Eh. When ALE is turned off, it will be reactivated when the program accesses external ROM/RAM data or jumps to execute an external ROM code.

The ALE signal will turn off again after it has been completely accessed or the program returns to internal ROM code space. The AO bit in the AUXR register, when set, disables the ALE output. In order to reduce EMI emission from oscillation circuitry, W77E058A allows user to diminish the gain of on-chip oscillator amplifiers by using programmer to clear the B7 bit of security register from Nuvoton Microcontroller W77E058A Flash Memory Breaking.

Once B7 is set to 0, a half of gain will be decreased. Care must be taken if user attempts to diminish the gain of oscillator amplifier, reducing a half of gain may effect to external crystal operating improperly at high frequency above 24 MHz. The value of R and C1, C2 may need adjustment while running at lower gain.

POF:

Power off flag. Bit is set by hardware when power on reset. It can be cleared by software to determine chip reset is a warm boot or cold boot.

GF1, GF0: These two bits are general-purpose flag bits for the user. PD:   Power down mode bit. Set it to enter power down mode. IDL:   Idle mode bit. Set it to enter idle mode.

The power-off flag is located at PCON.4. This bit is set when VDD has been applied to the part. It can be used to determine if a reset is a warm boot or a cold boot if it is subsequently reset by software.

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