NEC PD17062 Manuale Utente

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Table 6-1 lists the operation and transfer instructions that can be executed for the data in the general-

purpose register and data memory.

Consider the following instruction:

ADD r, m ((r) 

←

 (r) + (m))

Upon executing this instruction, the address of the general-purpose register is generated from the value

of the general-purpose register pointer and the value specified in r, as shown in Table 6-2.  Then, the contents

of the general-purpose register specified by the generated address of the general-purpose register are added

to the contents of the data memory location specified in m, the result being stored into the general-purpose

register.

The address of the general-purpose register is generated, as described above, for each of the instructions

listed in Table 6-1.

Data memory address

specified in m

Instruction

Address

Generated address

Bank 

Row address

Column address

General-purpose register

address specified in r 

ADD  r, m

(0000B)

(BANK)

(00 

× × 

B)

m

(RP)

r

Instruction set

Instruction

Operation

Addition

ADD

r, m

(r) 

←

 (r) + (m)

ADDC

r, m

(r) 

←

 (r) + (m) + CY

Subtraction

SUB

r, m

(r) 

←

 (r) – (m)

SUBC

r, m

(r) 

←

 (r) – (m) – CY

Logical operation

AND

r, m

(r) 

←

 (r) 

∧

 (m)

OR

r, m

(r) 

←

 (r)

 ∨

 (m)

XOR

r, m

(r) 

←

 (r) 

∨−

 (m)

Transfer

LD

r, m

(r) 

←

 (m)

ST

m, r

(m) 

←

 (r)

MOV

@r, m

if MPE = 1:  (MP, (r)) 

← 

(m)

if MPE = 0:  (BANK, m

R

, (r)) 

← 

(m)

MOV

m, @r

if MPE = 1:  (m) 

← 

(MP, (r))

if MPE = 0:  (m) 

← 

(BANK, m

R

, (r))

Shift

RORC

r

Right shift, including a carry