If only to be able to edit....

I made a number of unfortunate typos in my prior post. Here is a re-hashed version of the post.

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The original poster has indicated he is using the C8051F040 part from Silicon Laboratories. This part actually has two UARTs which is the reason I belive he has referred to the UART he is trying to program as UART0. The second UART is referred to as UART1. With these parts the UART0 operates with a high degree of similarity to the old defacto standard Intel 8051 UART. The UART0 serial interrupt enable bit in the IE register is actually named ES0. There is a corresponding ES1 bit to enable the interrupts for the second UART1. This is located in an extended interrupt enable register called EIE2 at the bit 6 position.

Michael Karas