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1.Why in the Pin diagram of LPC2148 P0.24,26 and 27 are available to user
2. Why the pins P1.0 to P1.15 also unavailable to user
Hi there, thanks for asking a question. Please look at the list of Support Forums we have here: https://community.arm.com/support-forums/ and let me know where is best to move your question to.
Moved to Keil forum
Maybe datasheet would help, it says:
Port 0: Port 0 is a 32-bit I/O port with individual direction controls foreach bit. Total of 31 pins of the Port 0 can be used as a generalpurpose bidirectional digital I/Os while P0.31 is output only pin. Theoperation of port 0 pins depends upon the pin function selected via thepin connect block.Pins P0.24, P0.26 and P0.27 are not available.
and:
Port 1: Port 1 is a 32-bit bidirectional I/O port with individual directioncontrols for each bit. The operation of port 1 pins depends upon thepin function selected via the pin connect block. Pins 0 through 15 ofport 1 are not available.