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Individual Instruction Descriptions
4-85
Assembly Language Instructions
4.14.8 CALL Unconditional Subroutine Call
Syntax
[label] name address
Clock,
clk
Word,
w
With RPT,
clk
Class
CALL
pma16
2 2 N/R 7c
CALL *A
n
2 1 N/R 7c
Execution *R7 ⇐ TOS
TOS ⇐ PC + 2
PC ⇐ pma16 or *An
R7 ⇐ R7 + 2
Flags Affected None
Opcode
Instructions 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CALL
pma16
1 0 0 0 0 1 0 1 0 1 0 1 0 0 0 0 0
x
pma16
CALL *A
n
1 0 0 0 1 1 0 A
n
0 0 0 0 0 0 0 0
Description PC + w is pushed onto the top of stack (TOS) and the second word operand
or accumulator value is loaded into the PC. Call instructions cannot immedi-
ately followed by RET instructions. No restrictions apply if IRET is used instead
of RET.
Syntax Description
CALL
pma16
Unconditional call to specified program memory address
pma16
.
CALL *A
n
Call to address referenced by A
n
.
See Also C
cc
, VCALL, RET, IRET
Example 4.14.8.1 CALL 0x2010
Call unconditionally program memory address 0x2010.
Example 4.14.8.2 CALL *A0
Call unconditionally program memory address stored in accumulator A0.