SN8F27E64KB datasheet(43/192 Pages) SONIX

43 / 192 page

SN8F27E60 Series

8-Bit Flash Micro-Controller with Embedded ICE and ISP

SONiX TECHNOLOGY CO., LTD

Page 43

Version 1.4

2.5.1 Fcpu Code Option

Fcpu means instruction cycle whose clock source includes high/low speed oscillator in different operating modes.

High_Fcpu and Low_Fcpu code options select instruction cycle pre-scaler to decide instruction cycle rate. In normal

mode (high speed clock), the system clock source is high speed oscillator, and Fcpu clock rate has eight options

including Fhosc/1, Fhosc/2, Fhosc/4, Fhosc/8, Fhosc/16, Fhosc/32, Fhosc/64, Fhosc/128. In slow mode (low speed

clock), the system clock source is internal low speed RC oscillator, and the Fcpu including Flosc/1, Flosc/2, Flosc/4,

Flosc/8.

2.5.2 Reset_Pin code option

The reset pin is shared with general input only pin controlled by code option.



Reset: The reset pin is external reset function. When falling edge trigger occurring, the system will be reset.



P04: Set reset pin to general bi-direction pin (P0.4). The external reset function is disabled and the pin is

bi-direction pin.

2.5.3 Security code option

Security code option is Flash ROM protection. When enable security code option, the ROM code is secured and not

dumped complete ROM contents.

2.5.4 Noise Filter code option

Noise Filter code option is a power noise filter manner to reduce noisy effect of system clock. If noise filter enable, In

high noisy environment, enable noise filter, enable watchdog timer and select a good LVD level can make whole

system work well and avoid error event occurrence.

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