Rabbit 2000 - Ld A,Eir

68 Rabbit 2000/3000 Microprocessor
Description
• LD A,EIR: Loads A with the data in the External Interrupt Register, EIR. 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 A,IIR: Loads A with the data in the Internal Interrupt Register, IIR. 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 A,EIR
LD A,IIR
Opcode Instruction Clocks Operation
ED 57 LD A,EIR 4 (2,2) A = EIR
ED 5F LD A,IIR 4 (2,2) A = IIR
Flags ALTD I/O
S Z L/V C F R SP S D
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