GPIO on LPC2106

Development Boards MicroMod
1

Hello,

i want to switch between 2 different states on 2 I/O Pins at the same time. For examble P0.0 is high an P0.1 is low - so i want P0.0 to low and P.1 to high with one instruction.

In C-Code i have to use IOCLR and IOSET to switch the pins. Is there a possibility to do this with only one instruction?

In the datasheet I found the IOPIN instruction in the GPIO section. It is signed as ReadOnly. But if i write: IOPIN ^= 0x3, the PINS will switch to the states at the same time. But normally (like it is discribed in the datasheet) it shouldn’t work. So does anyone know a better solution for my problem or is the datasheet not correct and the IOPIN instruction is for reading and writing?

2

Check the IOPIN register description at the top of page 82 of the LPC2106 User Manual (Rev 5); it describes writing to the IOPIN. Its possible, the problem is the you must modify all 32 bits per write. This can quickly become a hassle when multiple independent peripherals are connected.

Hope this helps,

Vern