CHAPTER 7
INTERRUPT LATCH ADDRESS

The interrupt latch address is used to detect which of the eight channels is creating the interrupt. The interrupt latch address is set to the interrupt vector address + 2H. The relationship between each port corresponds to the interrupt indicator as shown in the following. When the corresponding bit is 0, an interrupt occurred, otherwise if the bit is 1, then no interrupt occurred.

The interrupt vector must start on a multiple of 10H.