UPD705100GJ-100-8 NEC [NEC], UPD705100GJ-100-8 Datasheet - Page 27

• Manufacturer Part Number: UPD705100GJ-100-8
• Description: V830TM 32-BIT MICROCONTROLLER
• Manufacturer: NEC [NEC]

10.1 Addressing Mode
10.1.1 Instruction addresses
executed, it is automatically incremented by 2 or 4, depending on the number of bytes constituting the instruction being
fetched. When a branch instruction is executed, the branch address is set in the PC by the following addressing mode:
(1) Relative addressing (to PC)
The V830 generates two types of addresses, as follows:
• Instruction addresses (used by instructions involving branching)
• Operand addresses (used by instructions which access data)
The instruction address is determined by the contents of the program counter (PC). Each time an instruction is
The signed 9 or 26 bits (displacement, or disp) of data contained in the operation code are added to the program
counter (PC). For this addition, the displacement is handled as twos complement data. Bit 8 or 25 is the sign
bit, respectively.
The JR, JAL, Bcond, and ABcond instructions use this addressing.
31
31
31
31
31
31
Sign extension
26 25
S
Addressing for Bcond and ABcond instructions
Sign extension
Addressing for JR and JAL instructions
PC
PC
PC
PC
+
+
disp 26
9 8
S
disp 9
PD705100
0
0
0
0
0
0
0
0
0
0
0
0
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