ecowx

External Control Out Word Indexed

ecowx RS, RA, RB

Stores a word to an external device using the EAR register.

Details

Stores a 32-bit word from RS to an external control device, using address formation from RA + RB and device selection from the External Address Register (EAR). This instruction requires special external interface hardware support and does not affect condition registers. It is typically used in embedded or specialized processor configurations.

Pseudocode Operation

EA ← (RA) + (RB)
ExternalStore32(EA, EAR, (RS))

Example

ecowx r3, r4, r5

Encoding

Binary Layout
31
0
RS
6
RA
11
RB
16
438
21
/
31
 
Format X-form
Opcode 0x7C00036C
Extension Base

Operands

  • RS
    Source
  • RA
    Base
  • RB
    Index