LPC2131/2132/2138 User Manual - mct.net

Philips Semiconductors Preliminary User Manual
ARM-based Microcontroller
Table 53: Pin Function Select Register Bits
LPC2131/2132/2138
Pinsel0 and Pinsel1 Values Function Value after Reset
0 0 Primary (default) function, typically GPIO Port
0 1 First alternate function
1 0 Second alternate function
1 1 Reserved
The direction control bit in the IO0DIR/IO1DIR register is effective only when the GPIO function is selected for a pin. For other
functions, direction is controlled automatically. Each derivative typically has a different pinout and therefore a different set of
functions possible for each pin. Details for a specific derivative may be found in the appropriate data sheet.
Pin Connect Block 84 November 22, 2004
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