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Call Unconditionally
CALL
7-59
Assembly Language Instructions
Syntax CALL
pma
[,
ind
[, AR
n
]] Indirect addressing
Operands pma: 16-bit program-memory address
n: Value from 0 to 7 designating the next auxiliary register
ind: Select one of the following seven options:
* *+ *– *0+ *0– *BR0+ *BR0–
CALL
pma
[
, ind
[
,
AR
n
]]
1514131211109876543210
0
11110101 ARU N NAR
pma
Note: ARU, N, and NAR are defined in Section 6.3,
Indirect Addressing Mode
(page 6-9).
Execution PC + 2 → TOS
pma → PC
Modify (current AR) and (ARP) as specified.
Status Bits None
Description The current program counter (PC) is incremented and pushed onto the top of
the stack (TOS). Then, the contents of the pma, either a symbolic or numeric
address, are loaded into the PC. Execution continues at this address. The cur-
rent auxiliary register and ARP contents are modified as specified.
Words 2
Cycles for a Single CALL Instruction
ROM
DARAM SARAM External
4 4 4 4+4p
†
Note: When this instruction reaches the execute phase of the pipeline, two additional instruc-
tion words have entered the pipeline. When the PC discontinuity is taken, these two
instruction words are discarded.
Example CALL 191,*+,AR0
Before Instruction After Instruction
ARP 1 ARP 0
AR1 05h AR1 06h
PC 30h PC 0BFh
TOS 100h TOS 32h
Program address 0BFh (191) is loaded into the program counter, and the pro-
gram continues executing from that location.
Opcode
Cycles