IFF <- 1
EI
None
| b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0 | |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | $FB |
The enable interrupt instruction sets both interrupt enable flip flops (IFFI and IFF2) to a logic 1, allowing recognition of any maskable interrupt.
NOTE: During the execution of this instruction and the following instruction, maskable interrupts are disabled.
None.
When the CPU executes an
EI
the maskable interrupt is enabled.