DP80390 datasheet(57/84 Pages) DCD

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DP80390 Instructions set details

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3.24.18.

MOV DPTR, #DATA16 - LARGE

Function:

Load active data pointer with a 16-bit constant in LARGE mode

Description: The active data pointer is loaded with the 16-bit constant indicated. The

16-bit constant is loaded into the second and third bytes of the

instruction. The second byte (DPH) is the high-order byte, while the

third byte (DPL) holds the low-order byte. No flags are affected. This is

the only instruction which moves 16 bits of data at once.

Operation:

(PC)

← (PC) + 3

DPH

← immediate data15...8

DPL

← immediate data7..0

Bytes:

Cycles:

Encoding:

immediate data 15...8

immediate data 7...0

3.24.19.

MOV DPTR, #DATA24* - FLAT

Function:

Load active data pointer with a 24-bit constant in FLAT mode

Description: The active data pointer is loaded with the 24-bit constant indicated. The

24 bit constant is loaded into the second, third and fourth bytes of the

instruction. The second byte (DPX or DPX1) is the high-order byte,

while the third byte (DPH) holds the mid-order byte and fourth (DPL).

No flags are affected. This is the only instruction which moves 24 bits of

data at once.

Operation:

(PC)

← (PC) + 4

DPX/DPX1

← immediate data23...16

DPH

← immediate data15...8

DPL

← immediate data7..0

Bytes:

Cycles:

Encoding:

immediate data 23...16

immediate data 15...8

immediate data 7...0

* instruction modified regarding to standard 80C51

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