LPC2478 Olimex schematic

Development Boards MicroMod
1

Hello,

I was looking at the Olimex schematics for LPC2478 and had a doubt about as to why the LPC2478 pins P0[4] to P0[9] are connected to the Graphic LCD through jumpers. Also, these lines are connected on the extension.

Can these lines be used to create a data bus by connecting these lines to data latch (e.g. 74HC541)? I intend to interface a matrix keyboard to LPC2478.

TIA for your advice!!

2

SushilR:
I was looking at the Olimex schematics for LPC2478 and had a doubt about as to why the LPC2478 pins P0[4] to P0[9] are connected to the Graphic LCD through jumpers. Also, these lines are connected on the extension.

The alternative intended use for these pins is for the I2S Interface. For details see Chapter 23 of the LPC24xx User Manual (UM10237).
3

Thank you for the prompt reply…

But can i use those pins to interface a matrix keyboard by using the buffer latch 74HCT541?

I intend to use those pins as a data bus so that i can interface more peripheral to LPC2478…

4

SushilR:
But can i use those pins to interface a matrix keyboard by using the buffer latch 74HCT541?

I'm only guessing but as each pair of those pins is used to control 2 bits of each of the RGB colours of the display I suppose you could use them for something else if you didn't need to use the full 24-bit colour depth of a display. Chapter 9 of the LPC2478 user manual indicates that they can be configured as GPIO pins.

I’m primarily a software guy. Check the 74HCT541 datasheet against the LPC2478 datasheet / user manual yourself to see if / how you can physically / electrically connect the two.