Set Interrupt Mode 2
IM
2
| b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0 | |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | $ED |
| 0 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | $5E |
The IM 2 instruction sets the vectored Interrupt Mode 2. This mode allows an indirect call to any memory location by an 8-bit vector supplied from the peripheral device. This vector then becomes the least-significant eight bits of the indirect pointer, while the I Register in the CPU provides the most-significant eight bits. This address points to an address in a vector table that is the starting address for the interrupt service routine.
None.