The devices also include two full-duplex UARTs, 13 interrupt sources with five priority levels, and variable length MOVX... The DS89C4x0 single-cycle 8051 processors come with flash memories up to ...

The 8051-compatible microcontrollers ... program shown in the code listing. The program code allows masking of the unusable or undesirable interrupts. Here, the variable IE_MASK is used to hide ...