UPD17P136ACT datasheet(71/292 Pages) NEC

71 / 292 page

CHAPTER 7 SYSTEM REGISTER (SYSREG)

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

R00B

MEM

0.0BH

M034

MEM

0.34H

MOV

MPL, #0110B

; MP

← 6 (Setting row address of @r)

MOV

MPH, #1000B

; MPE

← 1, bank ← 0

MOV

R00B, #0EH

; R00B

← 0EH (Setting column address of @r)

MOV

M034, @R00B

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

← (0.6EH)

As shown in Figure 7-11, when the above instructions are executed, the data stored in address 6EH

is transferred to data memory location M034.

Figure 7-11. Operation Example When IXE = 0 and MPE = 1

Addresses in Example 1

Addresses in Example 2

MOV @R005, M034

MOV M034, @R00B

0123456789

Column address

System register

Column address specified

as transfer destination

Column address specified

as transfer source

Example 1. MOV @R005, M034

General

Memory

pointer

= 00110B

Example 2. MOV M034, @R00B

0000

Bank

Row

address

Column

address

011

0100

0000

1011

000

0000

1110

110

0000

Bank

Row

address

Column

address

011

0100

0000

0101

000

0000

1000

110

Data memory address M

General register address R

Indirect transfer address @R

Contents

of R

Contents of MP

Contents

of R

Data memory address M

General register address R

Indirect transfer address @R

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