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98 EPSON S1C63000 CORE CPU MANUAL
CHAPTER 4: INSTRUCTION SET
JRNC sign8 Jump to relative location sign8 if C flag is reset 1 cycle
Function: If C = 0 then PC ← PC + sign8 + 1 (sign8 = -128~127)
Executes the "JR sign8" instruction if the C (carry) flag has been reset to "0", otherwise executes
the next instruction.
Code:
Mnemonic MSB LSB
JRNC sign8 00101s7s6s5s4s3s2s1s00500H–05FFH
Flags: EICZ
↓ –––
Mode: Signed 8-bit PC relative
Extended addressing: Valid
Extended LDB %EXT,imm8
operation: JRNC sign8 If C = 0 then PC ← PC + sign16 + 1
(sign16 = -32768 to 32767, upper 8-bit: imm8, lower 8-bit: sign8)
JRNZ sign8 Jump to relative location sign8 if Z flag is reset 1 cycle
Function: If Z = 0 then PC ← PC + sign8 + 1 (sign8 = -128~127)
Executes the "JR sign8" instruction if the Z (zero) flag has been set to "1", otherwise executes
the next instruction.
Code:
Mnemonic MSB LSB
JRNZ sign8 00111s7s6s5s4s3s2s1s00700H–07FFH
Flags: EICZ
↓ –––
Mode: Signed 8-bit PC relative
Extended addressing: Valid
Extended LDB %EXT,imm8
operation: JRNZ sign8 If Z = 0 then PC ← PC + sign16 + 1
(sign16 = -32768 to 32767, upper 8-bit: imm8, lower 8-bit: sign8)