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LPC 2129 Chip Specification:
what is the pclk?
ARM7 LPC2129 Microcontroller needs two clocks; one is for its peripherals and other for its CPU. CPU works faster with higher frequencies whereas peripheral needs lower frequency to work with. The Peripheral Clock (PCLK) and CPU Clock (CCLK) gets clock input from a PLL or from external source.
The Peripheral Clock i.e. PCLK is derived from CPU Clock i.e. CCLK. The APB Divider decides the operating frequency of PCLK. The input to APB Divider is CCLK and output is PCLK. By Default PCLK runs at 1/4th the speed of CCLK.
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