UPD17P133CS datasheet(67/289 Pages) NEC

67 / 289 page

CHAPTER 7

SYSTEM REGISTER (SYSREG)

7.5.4 MPE=1 and IXE=0 (Diagonal Indirect Data Transfer)

As shown in Figure 7-8, the indirect data transfer bank and row address specified by @r become the data memory

row address pointer value only when general register indirect data transfer instructions (MOV @r, m and MOV m,

@r) are used.

Example 1. When the general register is in row address 0

R005

MEM

0.05H

M034

MEM

0.34H

MOV

MPL, #0110B

; MP

← 6

MOV

R005, #8

; R005

← 8

MOV

MPH, #1000B

; MPE

← 1

MOV

@R005, M034

; Indirect transfer of data in the register

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

memory address M034 is transferred to data memory location 68H.

When the MOV @r, m instruction is executed when MPE=1, the contents of the data memory

address specified by m is transferred to the column address pointed to by the row address

@r being pointed to by the memory pointer.

In this case, the indirect address specified by @r becomes the value used for the bank and

row address data memory pointer (above example uses row address 6). The column address

is the value in the general register address specified by r (above example uses column address

8).

Therefore the address in the above example is 68H.

This example is different from Example 2 in 7.5.3 when MPE=0 for the following reasons:

In this example, the data memory row address pointer is used to point to the indirect address

bank and row address specified by @r. (In Example 2 in 7.5.3 the indirect address bank and

row address are the same as m.)

By setting MPE=1, diagonal indirect data transfer can be performed using the general

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