NEC PD17062 - Manual (Page 60)

60
µ
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
register r. (See Example 2 in Fig. 8-3).
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
register r to m (See Example 3 in Fig. 8-3). The (transfer) source and (transfer) destination
are exactly opposite to those in example 2.