WAKEUP0 pin intermittent

Discussion created by lpcware Employee on Jun 15, 2016
Content originally posted in LPCWare by jinfeei on Thu Dec 31 01:22:57 MST 2015
Hi, I'm using LPC1820. To wakeup the MCU, I'm using the WAKEUP0 pin. This PIN is also tied to another pin on the MCU configured as an INPUT.

However, I found the WAKEUP0 pin tend to pull this other (input) pin low intermittently. If I disconnect the WAKEUP0 pin, the other input pin is working properly.

The WAKEUP0 pin can function properly most of the time (to wake up the MCU from Deep Sleep). I don't know what else I need to configure the WAKEUP0 pin aside from bits 14/15 in the CREG0 register.

I seriously suspect there is a bug on the WAKEUP0 pin. Does anyone else have the same problem?