SYSCON Pin description

The SYSCON inputs and outputs are assigned to external pins through the switch matrix.

See SWM Connect an internal signal to a package pin to assign the CLKOUT function to a pin on the LPC81x package.

See SWM Enable an analog input or other special function to enable the clock input, the oscillator pins, and the external reset input.

Table 1. SYSCON SYSCON pin description
Function Direction Pin Description SWM register Reference
CLKOUT O any CLKOUT clock output. PINASSIGN8 SWM registerName = PINASSIGN8 addressOffset = 0x020
CLKIN I PIO0_1/ACMP_I2/CLKIN External clock input to the system PLL. Disable the ACMP_I2 function in the PINENABLE register. PINENABLE0 SWM registerName = PINENABLE0 addressOffset = 0x1C0
XTALIN I PIO0_8/XTALIN Input to the system oscillator. PINENABLE0 SWM registerName = PINENABLE0 addressOffset = 0x1C0
XTALOUT O PIO0_9/XTALOUT Output from the system oscillator. PINENABLE0 SWM registerName = PINENABLE0 addressOffset = 0x1C0
RESET I RESET/PIO0_5 External reset input PINENABLE0 SWM registerName = PINENABLE0 addressOffset = 0x1C0

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