SN8P2604A
8-Bit Micro-Controller
4.4 SYSTEM HIGH CLOCK
The system high clock is from external oscillator. The high clock type is controlled by “High_Clk” code option.
High_Clk Code Option
Description
RC
32K
12M
4M
The high clock is external RC type oscillator. XOUT pin is general purpose I/O pin.
The high clock is external 32768Hz low speed oscillator.
The high clock is external high speed oscillator. The typical frequency is 12MHz.
The high clock is external oscillator. The typical frequency is 4MHz.
4.4.1 EXTERNAL HIGH CLOCK
External high clock includes three modules (Crystal/Ceramic, RC and external clock signal). The high clock oscillator
module is controlled by High_Clk code option. The start up time of crystal/ceramic and RC type oscillator is different.
RC type oscillator’s start-up time is very short, but the crystal’s is longer. The oscillator start-up time decides reset time
length.
4MHz Crystal
RC
32768Hz Crystal
4MHz Ceramic
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