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THROUGH THE LOOKING GLASS

Taking a Look at the PIC18Cxxx Series
by David Brobst

Start ý PIC18Cxxx Chips ý Memory ý Data Memory ý Advanced Indirect Addressing ý Deep and Accessible Stack ý Interrupts ý Power-On Features ý Clock Speed ý 10-Bit A/D ý Hardware Multiplier ý Timers ý CCP/PWM ý USART ý I²C Master ý Table Read/Write ý Current Status ý Sources and PDF

CLOCK SPEED

The PIC18Cxxx family has a built-in PLL circuit that multiplies the internal instruction clock by four to generate the internal instruction clock. With the PIC architecture, this means 10-MIPS performance is available when running off of a system clock of 10 MHz. Unfortunately, the PLL is not rated to run with a clock faster than the 10 MHz. So, while the 10-MIPS performance is a sizable improvement over the maximum speed of earlier processors, it is not a quantum leap from the 5-MIPS performance of the mid-range devices.

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