UPD17P136ACT datasheet(69/292 Pages) NEC

69 / 292 page

CHAPTER 7 SYSTEM REGISTER (SYSREG)

Example 3.

Execution of “MOV m, @r” when general register is in row address 0

R00B

MEM

0.0BH

M034

MEM

0.34H

MOV

R00B, #0EH

; R00B

← 0EH (Setting column address of @r)

MOV

M034, @R00B

; Indirect transfer of data in the register (0.34H)

← (0.3EH)

As shown in Figure 7-10, when the above instructions are executed, the contents of data

memory stored at address 3EH is transferred to data memory location M034.

The “MOV m, @r” instruction transfers the contents of the data memory of the address which

the column address is specified by @r to a data memory address specified by m.

In the above example, therefore, data at 3EH is transferred to M034 whose row address is the

same as that of M034 (= 3) and column address is specified by the contents of R00B (= 0EH).

Figure 7-10. Operation Example When IXE = 0 and MPE = 0

Addresses in Example 1

Addresses in Example 2

ADD R003, M061

MOV @R005, M034

0123456789

Column address

System register

Column address specified

as transfer destination

Column address specified

as transfer source

Example 2. MOV @R005, M034

Example 3. MOV M034, @R00B

Example 1. ADD R003, M061

General

0000

Bank

Row

address

Column

address

110

0001

0000

0011

000

0000

Bank

Row

address

Column

address

011

0100

0000

0101

000

0000

1000

011

Data memory address M

General register address R

Indirect transfer address @R

Data memory address M

General register address R

Contents

of R

Same as M

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