upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 47
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upd78f0730
Manufacturer Part Number
upd78f0730
Description
8-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0730.pdf
(518 pages)
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3.3 Instruction Address Addressing
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 PC and branched by
the following addressing (for details of instructions, refer to the 78K/0 Series Instructions User’s Manual (U12326E)).
3.3.1 Relative addressing
An instruction address is determined by contents of the program counter (PC), and is normally incremented (+1 for
[Function]
[Illustration]
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.
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.
PC
When S = 0, all bits of
When S = 1, all bits of
15
15
15
are 0.
are 1.
8
PC
+
Preliminary User’s Manual U19014EJ1V0UD
CHAPTER 3 CPU ARCHITECTURE
7
S
6
jdisp8
0
0
0
...
PC indicates the start address
of the instruction after the BR instruction.
The
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