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CALL mn     Call Subroutine     Rabbit 2000/3000/4000/5000 Instruction

Opcode	Instruction	Operation
CD n m	CALL mn	(SP - 1) = PChigh (SP - 2) = PClow PC = mn SP = SP - 2

Clocks	8-Bit Access	16-Bit Unaligned	16-Bit Aligned
Rabbit 2000/3000/4000	12	n/a	n/a
Rabbit 5000	13	11	11

Flags				ALTD			IOI/IOE
S	Z	L/V	C	F	R	SP	S	D
-	-	-	-

Description

This instruction is used to call a subroutine. First PC is pushed onto the stack. The high-order byte of PC is pushed first, then the low-order byte. PC is then loaded with mn, which is the16-bit address of the first instruction of the subroutine. SP is updated to reflect the two bytes pushed onto the stack.

The Dynamic C assembler recognizes the instruction

CALL label

where mn is coded as a label.