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UPD780138 Datasheet(PDF) 78 Page - NEC

No. de Pieza. UPD780138
Descripción  8-Bit Single-Chip Microcontrollers
Descarga  558 Pages
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Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD780138 Datasheet(HTML) 78 Page - NEC

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CHAPTER 3 CPU ARCHITECTURE
User’s Manual U16228EJ2V0UD
78
3.3 Instruction Address Addressing
An instruction address is determined by program counter (PC) contents and is normally incremented (+1 for each
byte) automatically according to the number of bytes of an instruction to be fetched each time another instruction is
executed. When a branch instruction is executed, the branch destination information is set to the PC and branched by
the following addressing (for details of instructions, refer to 78K/0 Series Instructions User’s Manual (U12326E).
3.3.1 Relative addressing
[Function]
The value obtained by adding 8-bit immediate data (displacement value: jdisp8) of an instruction code to the
start address of the following instruction is transferred to the program counter (PC) and branched.
The
displacement value is treated as signed two’s complement data (
−128 to +127) and bit 7 becomes a sign bit.
In other words, relative addressing consists of relative branching from the start address of the following
instruction to the
−128 to +127 range.
This function is carried out when the BR $addr16 instruction or a conditional branch instruction is executed.
[Illustration]
15
0
PC
+
15
0
876
S
15
0
PC
α
jdisp8
When S = 0, all bits of
are 0.
When S = 1, all bits of
are 1.
PC indicates the start address
of the instruction after the BR instruction.
...
α
α


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