参数资料
型号: m789436
厂商: NEC Corp.
元件分类: 8位微控制器
英文描述: 8-Bit Single-Chip Microcontrollers
中文描述: 8位单芯片微控制器
文件页数: 110/144页
文件大小: 1378K
代理商: M789436
CHAPTER 3 CPU ARCHITECTURE
68
User’s Manual U15075EJ1V0UM00
3.3 Instruction Address Addressing
An instruction address is determined by the program counter (PC) contents.
The PC contents are 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 each instruction, refer to 78K/0S Series
Instructions User’s Manual (U11047E)).
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.
This means that information is relatively branched to a location between –128 and +127, from the start
address of the next instruction when relative addressing is used.
This function is carried out when the BR $addr16 instruction or a conditional branch instruction is executed.
[Illustration]
15
0
PC
15
0
S
15
0
PC
+
87
6
α
jdisp8
When S = 0,
α indicates all bits 0.
... PC is the start address of
the next instruction of
a BR instruction.
When S = 1,
α indicates all bits 1.
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