Call Unconditionally
CALL
7-59
Assembly Language Instructions
Syntax
CALL
pma [, ind [, ARn] ]
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 [, ARn] ]
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
1
1
1
1
0
1
0
1
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
