NEC PD17062 Instrukcja Użytkownika Pobierz pdf (Strona 60)

PD17062

8.5.3 For MPE = 0 and IXE = 0 (Data Memory Not Modified)

As shown in Table 8-2, data memory addresses are not affected by the index register or data memory row

address pointer.

Example 1. When the row address of the general-purpose register is 0 for BANK0

ADD 03H, 11H

When the above instruction is executed, the contents of general-purpose register 03H and

data memory 11H are added and the result is stored in general-purpose register 03H. (See

Example 1 in Fig. 8-3).

Example 2. When the row address of the general-purpose register is 0 for BANK0

MOV 05H, #8 ; 05H ← 8

MOV @05H, 34H ; Register indirect transfer

When the above instruction is executed, the contents of the data memory at address 34H are

transferred to address 38H. This means that the MOV @ r, m instruction transfers the contents

of data memory m to the same row address (in the above case, 3) as m and the column address

(in the above case, 38H) specified by the contents (in the above case, 8) of general-purpose

Example 3. When the row address of the general-purpose register is 0 for BANK0

MOV 0BH, #0EH ; 0BH ← 0EH

MOV 34H @0BH ; Register indirect transfer

When the above instruction is executed, the contents of the data memory are transferred from

address 3EH to 34H. This means that the MOV m, @r instruction transfers the contents at

the same row address (in the above case, 3) as data memory m and at the column address

(in the above case, 3EH) specified by the contents (in the above case, 0EH) of general-purpose

are exactly opposite to those in example 2.

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NEC PD17062 Instrukcja Użytkownika Strona 60