UPD17P133CS datasheet(71/289 Pages) NEC

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CHAPTER 7

SYSTEM REGISTER (SYSREG)

Example 2. Indirect data transfer using the general register

Assume that the general register is row address 0.

R005

MEM

0.05H

M034

MEM

0.34H

MOV

IXL, #0001B

;

← 00000000001B

MOV

IXM, #0000B

;

MOV

IXH, #0000B

;

MPE

← 0

PSW, #.DF.IXE AND 0FH ;

IXE

← 1

MOV

R005, #8

;

R005

← 8

MOV

@R005, M034

;

Indirect data transfer using the

As shown in Figure 7-12, when the above instructions are executed, the contents of data

memory address 35H is transferred to data memory location 38H.

When the MOV @r, m instruction is executed when IXE=1, the data memory address

specified by m (direct address) is modified using the contents of the index register. The bank

and row address of the indirect address specified by @r are also modified using the index

The bank, row address, and column address specified by m (direct address) are all modified,

and the bank and row address specified by @r (indirect address) are modified. Therefore,

in the above example the direct address is 35H and the indirect address is 38H. This example

is different from Example 3 in 7.5.3 when IXE=0 for the following reasons: In this example,

the bank, row address and column address of the direct address specified by m are modified

using the index register. The general register is transferred to the address specified by the

column address of the modified data memory address and the same row address. (In

Example 3 in 7.5.3 the direct address is not modified.)

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