Intel 8XC251SP Manuel D’Utilisation

A-3

dir8

An 8-bit direct address. This can be a memory address
(00:0000H–00:00FFH) or an SFR address (S:00H - S:FFH).

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dir16

A 16-bit memory address (00:0000H–00:FFFFH) used in direct 
addressing.

✔

#data

An 8-bit constant that is immediately addressed in an instruction. 

✔

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#data16

A 16-bit constant that is immediately addressed in an instruction.

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#0data16
#1data16

 A 32-bit constant that is immediately addressed in an instruction. The 
upper word is filled with zeros (#0data16) or ones (#1data16).

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#short

v v

A constant, equal to 1, 2, or 4, that is immediately addressed in an 
instruction.

Binary representation of #short.

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bit

y y y

A directly addressed bit in memory locations 00:0020H–00:007FH or in 
any defined SFR.
A binary representation of the bit number (0–7) within a byte.

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bit51

A directly addressed bit (bit number = 00H–FFH) in memory or an SFR. 
Bits 00H–7FH are the 128 bits in byte locations 20H–2FH in the on-chip 
RAM. Bits 80H–FFH are the 128 bits in the 16 SFR’s with addresses 
that end in 0H or 8H: S:80H, S:88H, S:90H, . . . , S:F0H, S:F8H.

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rel

A signed (two's complement) 8-bit relative address. The destination is 
-128 to +127 bytes relative to first byte of the next instruction. 

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addr11

An 11-bit destination address. The destination is in the same 2-Kbyte 
block of memory as the first byte of the next instruction.

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addr16

A 16-bit destination address. A destination can be anywhere within 
the same 64-Kbyte region as the first byte of the next instruction.

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addr24

A 24-bit destination address. A destination can be anywhere within 
the 16-Mbyte address space.

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