simple program using c8051F120 MCU

xbr2 = 0xc0

I just want to execute a simple routine using the c8051F120 MCU. I attempted to open port 2 and then enable the crossbar so that my 8 leds hooked up to the port can glow. using this code:

include <c8051F120.h> // SFR declarations
void InitPort()
{
XBR2 = 0xD8; // Enable crossbar and weak pull-up
P2MDOUT |= 0xFF;
}
void main()
{
InitPort();
}

Well it doesn't work!:x

As a sanity check (salvage my self esteem) I attempted to use the c8051F005 MCU and open port 2 and then enable the crossbar so that my 8 leds hooked up to the port can glow. using this code:

#include <c8051F000.h>
void InitPort()
{
XBR2 = 0x40;
PRT2CF |= 0xFF;
}
void main()
{
InitPort();
}

and it worked!

Can anyone help me identify the subtle differences between the two MCU's that are preventing me from succesfully opening the c8051F120 port2?

One thing I noticed and implemented was that (XBR2.4) has to be set to a logic 1 for the 120.


data sheet and such for the c8051f120
https://www.silabs.com/pages/search.aspx?k=C8051F120&searchtypeid=1


data sheet and such for the c8051f005
https://www.silabs.com/pages/search.aspx?k=C8051F005&searchtypeid=1

Hi,

/*****************************************
include <c8051F120.h> // SFR declarations
void InitPort()
{
XBR2 = 0xD8; // Enable crossbar and weak pull-up
P2MDOUT |= 0xFF;
}
void main()
{
InitPort();
}
*****************************************/
i think for enabling crossbar & disabling weak pull-up's the register seting is XBR2 = 0xC0;

if u set it as 0xD8, u r routing some port pins to the other peripherals.Check out the Register configuration


Bye.