NEC PD17062 - page 42

PD17062

6.3 ADDRESS GENERATION FOR GENERAL-PURPOSE REGISTER AND DATA MEMORY IN INDIVIDUAL

INSTRUCTIONS

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

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

listed in Table 6-1.

Table 6-1 Manipulation Instructions Executed between the General-Purpose Register and Data Memory

Table 6-2 Address Generation for General-Purpose Register and Data Memory

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)

(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, mR, (r)) ← (m)

MOV m, @r if MPE = 1: (m) ← (MP, (r))

if MPE = 0: (m) ← (BANK, mR, (r))

Shift RORC r Right shift, including a carry