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Individual Instruction Descriptions
4-85Assembly 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 *An 2 1 N/R 7c
Execution R7 ⇐ R7 + 2
*R7 ⇐ TOS
TOS ⇐ PC + 2
PC ⇐ *An or pma16
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 1 1 1 1 0
x pma16
CALL *An 1 0 0 0 1 1 0 An
†
0 0 0 1 1 1 1 0
†
The value of An is in the following table.
An
Bit 9 Bit 8
A0 0 0
A1 0 1
A2 1 0
A3 1 1
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 *An Call to address referenced by An.
See Also Ccc, 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.