UPD17062 datasheet(64/298 Pages) RENESAS

64 / 298 page

µPD17062

8.5.4

For MPE = 1 and IXE = 0 (Diagonal Indirect Transfer)

As shown in Table 8-2, the bank and row address of the data memory address in the indirect side specified

by the general-purpose register are set to the value of the data memory row address pointer only when a

general-purpose register indirect transfer instruction is executed.

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

MOV

MPL,

#0101B

; MP

← 00101B

MOV

MPH,

#1000B

; MPE

← 1

MOV

05H,

; 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 58H of data memory. This means that the MOV @r, m instruction at

MPE = 1 transfers the contents of data memory m to the data memory whose bank and row

addresses are the values of the data memory row address pointer (in the above example,

BANK0, row address 5) and whose column address is specified (in the above case, 58H of

BANK0) by general-purpose register r (in the above case, 8). (See Example 1 in Fig. 8-4.)

Compared to MPE = 0 (Example 2 in Section 8.5.3), the bank and row address of the data

memory address in the indirect side specified by the general-purpose register can be

specified by the data memory row address pointer (in Example 2 of Section 8.5.3, the bank

and row address in the indirect side are the same as those of m). Therefore, specifying MPE

= 1 enables general-purpose register diagonal indirect transfer to be performed.

Similarly, the MOV m, @r instruction becomes as shown in Example 2.

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

MOV

MPL,

#0101B

; MP

← 00101B

MOV

MPH,

#1000B

; MPE

← 1

MOV

0BH, #0EH

; 0BH

← 0EH

MOV

3AH, @05H

(See Example 2 in Fig. 8-4.)

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