Computer Hardware User's Manual

96
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
User's Manual U12326EJ4V0UM
Call Table
CALLT
Subroutine Call (Refer to the Call Table)
[Instruction format] CALLT [addr5]
[Operation] (SP– 1) ← (PC+1)
H,
(SP–2) ← (PC+1)
L,
SP ← SP–2,
PC
H ← (00000000, addr5+1)
PC
L ← (00000000, addr5)
[Operand]
Mnemonic Operand([addr5])
CALLT [addr5]
[Flag]
ZACCY
[Description]
• This is a subroutine call for call table reference.
• The start address (PC+1) of the next instruction is saved in the stack and is branched to the address indicated
with the word data of a call table (the higher 8 bits of address are fixed to 00000000B and the next 5 bits
are specified by addr5).
[Description example]
CALLT [40H]; Subroutine call to the word data addresses 0040H and 0041H.