cpdr

Block Search // CPDR (ComPare and Decrement Repeated)

0xEDB9 - u60857

Description

Compares the value of the memory location pointed to by hl with a. Then hl and bc are decremented. If bc is not zero and z is not set, this operation is repeated. Interrupts can trigger while this instruction is processing.

T States	Bytes
21	2

Condition Bits Affected

S affected as defined
Z affected as defined
H affected as defined
P/V reset
N set
C unaffected

source

{
  "flags": {
    "S": "affected as defined",
    "Z": "affected as defined",
    "H": "affected as defined",
    "P/V": "reset",
    "N": "set",
    "C": "unaffected"
  },
  "operation": "cpdr",
  "opcode": "cpdr",
  "operand": [],
  "code": "EDB9",
  "bytes": 2,
  "time": 21,
  "description": "Compares the value of the memory location pointed to by hl with a. Then hl and bc are decremented. If bc is not zero and z is not set, this operation is repeated. Interrupts can trigger while this instruction is processing.",
  "category": "Block Search",
  "subCategory": "CPDR (ComPare and Decrement Repeated)"
}