Instruction Reference Manual 73
Description
• LD EIR,A: Loads the External Interrupt Register, EIR, with the data in A. The EIR is used to
specify the Most Significant Byte (MSB) of the External Interrupt address. The value loaded in
the EIR is concatenated with the appropriate External Interrupt address to form the 16-bit ISR
starting address.
• LD IIR,A: Loads the Internal Interrupt Register, IIR, with the data in A. The IIR is used to
specify the Most Significant Byte (MSB) of the Internal Peripheral Interrupt address. The value
loaded in the IIR is concatenated with the appropriate Internal Peripheral address to form the 16-
bit ISR starting address for that peripheral.
LD EIR,A
LD IIR,A
Opcode Instruction Clocks Operation
ED 47 LD EIR,A 4 (2,2) EIR=A
ED 4F LD IIR,A 4 (2,2) IIR=A
Flags ALTD I/O
S Z L/V C F R SP S D
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