DP80390 datasheet(16/84 Pages) DCD

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DP80390 Instructions set details

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3.1.2. FLAT

Instruction:

ACALL addr19

Function:

Absolute call

Description:

ACALL unconditionally calls a subroutine located at the indicated

address. The instruction increments the PC triple to obtain the address

of the following instruction, then pushes the 24-bit result onto the stack

(low-order byte first) and increments the stack pointer triple. The

destination address is obtained by successively concatenating the five

high-order bits of the incremented PC, opcode bits 7-5, the second and

third byte of the instruction. The subroutine called must therefore start

within the same 512K block of program memory as the first byte of the

instruction following ACALL. No flags are affected.

Operation:

(PC)

← (PC) + 3

(SP)

← (SP) + 1

((SP))

← (PC7-0)

(SP)

← (SP) + 1

((SP))

← (PC15-8)

(SP)

← (SP) + 1

((SP))

← (PC23-16)

(PC18-0)

← page address

Bytes:

Cycles:

Encoding:

a18 a17 a16

a15 a14 a13 a12 a11 a10 a9

* instruction modified regarding to standard 80C51

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