UPD17P133CS datasheet(103/289 Pages) NEC

103 / 289 page

CHAPTER 11

ARITHMETIC AND LOGIC UNIT

Table 11-1. List of ALU Instructions (1/2)

ALU Functions

Instruction

Operation

Explanation

ADD r, m

(r)

← (r) + (m)

Adds contents of general register and data memory.

Result is stored in general register.

ADD m, #n4

(m)

← (m) + n4

Adds immediate data to contents of data memory.

Result is stored in data memory.

ADDC r, m

(r)

← (r) + (m) + CY

Adds contents of general register, data memory and

carry flag. Result is stored in general register.

ADDC m, #n4

(m)

← (m) + n4 + CY

Adds immediate data, contents of data memory and

carry flag. Result is stored in data memory.

SUB r, m

(r)

← (r) – (m)

Subtracts contents of data memory from contents of

general register. Result is stored in general register.

SUB m, #n4

(m)

← (m) – n4

Subtracts immediate data from data memory. Result

is stored in data memory.

SUBC r, m

(r)

← (r) – (m) – CY

Subtracts contents of data memory and carry flag from

contents of general register. Result is stored in general

SUBC m, #n4

(m)

← (m) – n4 – CY

Subtracts immediate data and carry flag from data

memory. Result is stored in data memory.

OR r, m

(r)

← (r)

(m)

OR operation is performed on contents of general

OR m, #n4

(m)

← (m)

OR operation is performed on immediate data and

contents of data memory.

Result is stored in data

memory.

AND r, m

(r)

← (r)

(m)

AND operation is performed on contents of general

AND m, #n4

(m)

← (m)

AND operation is performed on immediate data and

contents of data memory.

Result is stored in data

memory.

XOR r, m

(r)

← (r)

(m)

XOR operation is performed on contents of general

XOR m, #n4

(m)

← (m)

XOR operation is performed on immediate data and

contents of data memory.

Result is stored in data

memory.

TRUE

SKT m, #n

CMP

← 0, if (m)

n=n,

Skips next instruction if all bits in data memory

then skip

specified by n are TRUE (1). Result is not stored.

FALSE

SKF m, #n

CMP

← 0, if (m)

n=0,

Skips next instruction if all bits in data memory

then skip

specified by n are FALSE (0). Result is not stored.

Equal

SKE m, #n4

(m) – n4, skip if zero

Skips next instruction if immediate data equals

contents of data memory. Result is not stored.

Not

SKNE m, #n4

(m) – n4, skip if not zero

Skips next instruction if immediate data is not equal

equal

to contents of data memory. Result is not stored.

≥

SKGE m, #n4

(m) – n4, skip if not borrow

Skips next instruction if contents of data memory is

greater than or equal to immediate data. Result is

not stored.

SKLT m, #n4

(m) – n4, skip if borrow

Skips next instruction if contents of data memory is

less than immediate data. Result is not stored.

Rotation

RORC r

Rotate contents of the general register along with

the CY flag to the right. Result is stored in general

Bit

judge-

ment

Rotate

to the

right

Arith-

metic

opera-

tions

Addi-

tion

Sub-

traction

Logical

opera-

tions

Logical

AND

Logical

XOR

→(r)b3→(r)b2→(r)b1→(r)b0

Com-

parison

judge-

ment

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