NEC 78K/0 Series - Manual (Page 113)

CHAPTER 5 EXPLANATION OF INSTRUCTIONS
113 User's Manual U12326EJ4V0UM
Branch if False
BF
Conditional Branch by Bit Test (Byte Data Bit = 0)
[Instruction format] BF bit, $addr16
[Operation] PC
← PC+b+jdisp8 if bit = 0
[Operand]
Mnemonic Operand(bit,$addr16) b(Number of bytes)
BF saddr.bit, $addr16 4
sfr.bit, $addr16 4
A.bit, $addr16 3
PSW.bit, $addr16 4
[HL].bit, $addr16 3
[Flag]
Z AC CY
[Description]
• If the 1st operand (bit) contents have been cleared (0), data is branched to the address specified by the 2nd
operand ($addr16).
If the 1st operand (bit) contents have not been cleared (0), no processing is carried out and the subsequent
instruction is executed.
[Description example]
BF P2.2, $1549H; When bit 2 of port 2 is 0, data is branched to address 1549H (with the start of this instruction
set in the range of addresses 14C6H to 15C5H).