DP80390 datasheet(50/84 Pages) DCD

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DP80390 Instructions set details

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3.22.2.

FLAT

Instruction:

LCALL addr24

Function:

Long call

Description:

LCALL calls a subroutine located at the indicated address. The

instruction adds four to the program counter to generate the address of

the next instruction and then pushes the 24-bit result onto the stack (low

byte first), incrementing the stack pointer by three. The high-order and

low-order bytes of the PC are then loaded, respectively, with the

second, third and fourth bytes of the LCALL instruction. Program

execution continues with the instruction at this address. The subroutine

may therefore begin anywhere in the full 16 MB program memory

address space. No flags are affected.

Operation:

(PC)

← (PC) + 4

(SP)

← (SP) + 1

((SP))

← (PC7-0)

(SP)

← (SP) + 1

((SP))

← (PC15-8)

(SP)

← (SP) + 1

((SP))

← (PC23-16)

(PC)

← addr23-0

Bytes:

Cycles:

Encoding:

address 23..16

address 15..8

address 7..0

* instruction modified regarding to standard 80C51

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