HD6433713 datasheet(35/324 Pages) RENESAS

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The @Rn+ mode is used with MOV instructions that load registers from memory.

The register field of the instruction specifies a 16-bit general register containing the

address of the operand. After the operand is accessed, the register is incremented by 1 for

MOV.B or 2 for MOV.W. For MOV.W, the original contents of the 16-bit general register

must be even.

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The @–Rn mode is used with MOV instructions that store register contents to memory.

The register field of the instruction specifies a 16-bit general register which is decremented

by 1 or 2 to obtain the address of the operand in memory. The register retains the

decremented value. The size of the decrement is 1 for MOV.B or 2 for MOV.W. For

MOV.W, the original contents of the register must be even.

Absolute Address—@aa:8 or @aa:16: The instruction specifies the absolute address of the

operand in memory.

The absolute address may be 8 bits long (@aa:8) or 16 bits long (@aa:16). The MOV.B and

bit manipulation instructions can use 8-bit absolute addresses. The MOV.B, MOV.W, JMP,

and JSR instructions can use 16-bit absolute addresses.

For an 8-bit absolute address, the upper 8 bits are assumed to be 1 (H'FF). The address range

is H'FF00 to H'FFFF (65280 to 65535).

Immediate—#xx:8 or #xx:16: The instruction contains an 8-bit operand (#xx:8) in its

second byte, or a 16-bit operand (#xx:16) in its third and fourth bytes. Only MOV.W

instructions can contain 16-bit immediate values.

The ADDS and SUBS instructions implicitly contain the value 1 or 2 as immediate data.

Some bit manipulation instructions contain 3-bit immediate data in the second or fourth byte

of the instruction, specifying a bit number.

Program-Counter Relative—@(d:8, PC): This mode is used in the Bcc and BSR

instructions. An 8-bit displacement in byte 2 of the instruction code is sign-extended to

16 bits and added to the program counter contents to generate a branch destination address.

The possible branching range is –126 to +128 bytes (–63 to +64 words) from the current

address. The displacement should be an even number.

HD6433713 Datasheet(PDF) 35 Page - Renesas Technology Corp