a compare function that compares the data register and port pin values for 4 programmable conditions and sets a software accessible flag if the condition is satisfied. Th.

ID0, ID1 - Chip identify pins, normally tied to VDD to VSS. The 4 possible combinations of these pins allow 4 I/Os to share a common chip enable. When the levels at these pins match those of the identify bits in the control word, the serial bus is e.

CDP68HC68A2

CDP68HC68R1

CDP68HC68R2

CDP68HC68S1

CDP68HC68T1

CDP68HC68W1

CDP68HC05C4

CDP68HC05C8

CDP68HC05D2

CDP6805E2

CDP6805E2C

CDP6805E3

CDP6805E3C