UPD17P133CS datasheet(65/289 Pages) NEC

65 / 289 page

CHAPTER 7

SYSTEM REGISTER (SYSREG)

7.5.3 MPE=0 and IXE=0 (No Data Memory Modification)

As shown in Figure 7-8, data memory addresses are not affected by the index register and the data memory row

address pointer.

(1) Data memory manipulation instructions

Example 1. General register is in row address 0

R003

MEM

0.03H

M061

MEM

0.61H

ADD

R003, M061

As shown in Figure 7-9, when the above instructions are executed, the data in general register

address R003 and data memory address M061 are added together and the result is stored

in general address R003.

(2) Indirect transfer of data in the general register (horizontal indirect transfer)

Example 2. General register is in row address 0

R005

MEM

0.05H

M034

MEM

0.34H

MOV

R005, #8

; R005

← 8

MOV

@R005, M034

; Indirect transfer of data in the register

As shown in Figure 7-9, when the above instructions are executed, the data stored in data

memory address M034 is transferred to data memory location 38H.

In other words, the MOV @r, m instruction causes the contents in the data memory address

specified by m to be transferred to the data memory location specified by @r (which by

definition has the same row address as m).

The indirect data transfer address has the same row address as m (example above uses row

address 3) and the column address is the value contained in the general register address

specified by r (example above uses column address 8). Therefore the address in the above

example is 38H.

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