UPD17062 datasheet(48/298 Pages) RENESAS

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µPD17062

6.4 NOTES ON USING THE GENERAL-PURPOSE REGISTER

This section provides notes on using the general-purpose register, referring to the following example:

Example

AND

RPL,

#000B

; RP

← 0000010B

RPL,

#0100B

;

MOV BANK, #0000B

; BANK0

04H, 32H

Executing the above instructions loads the contents of address 32H of BANK0 data memory into address

24H in the general-purpose register of BANK0.

In the above example, the general-purpose register is allocated in row address 2H of BANK0, so that the

address of the general-purpose register specified in r in instruction LD r, m is address 24H of BANK0. The

data memory address specified in m is address 32H of BANK0. (See Fig. 6-5.)

Note that it is necessary to code an actual data memory address, for example, 24H, as the value specified

in r when using the assembler. In this case, only the low-order four bits are needed as the value for r, so the

assembler ignores value 2H, which is a row address. Thus, executing instruction LD 24H, 32H produces the

same result as executing the instruction in the above example.

If, when using the assembler, the address of the general-purpose register is specified directly in an operand

of an instruction, as shown below, an error occurs.

Instruction that causes an error

04H,

32H

; The address of the general-purpose register is coded as 04.

Most commonly used method

MEM

0.04H

;

MEM

0.32H

;

# R1 and M1 are defined as memory-type addresses, and are

R1,

;

assigned addresses 04H and 32H of BANK0, respectively.

Executing the following instructions produces the same result as executing the instructions in

# because

R1 and R2 are assigned the same column address.

MEM

0.34H

MEM

0.32H

R2,

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