DR805x Instructions set details
- 46 -
3.22.
LCALL
LCALL addr16
Long call
LCALL calls a subroutine located at the indicated address. The
instruction adds three to the program counter to generate the address
of the next instruction and then pushes the 16-bit result onto the stack
(low byte first), incrementing the stack pointer by two. The high-order
and low-order bytes of the PC are then loaded, respectively, with the
second and third bytes of the LCALL instruction. Program execution
continues with the instruction at this address. The subroutine may
therefore begin anywhere in the full 64 Kbyte program memory address
space. No flags are affected.
(PC)
←
(PC) + 3
(SP)
←
(SP) + 1
((SP))
←
(PC7-0)
(SP)
←
(SP) + 1
((SP))
←
(PC15-8)
(PC)
←
addr15-0
3
6
Instruction:
Function:
Description:
Operation:
Bytes:
Cycles:
Encoding:
0
0
0
1
0
0
address 15..8
address 7..0
1
0
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