UPD17P136ACT datasheet(105/292 Pages) NEC

105 / 292 page

CHAPTER 11 ARITHMETIC AND LOGIC UNIT (ALU)

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

ALU function

Instruction

Operation

Explanation

Arithmetic

Addition

ADD r, m

(r)

← (r) + (m)

Adds contents of general register and data memory.

operations

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,

(m)

← (m) + n4 + CY

Adds immediate data, contents of data memory and carry

#n4

flag. Result is stored in data memory.

Subtraction SUB r, m

(r)

← (r) – (m)

Subtracts contents of data memory from contents of general

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,

(m)

← (m) – n4 – CY

Subtracts immediate data and carry flag from data memory.

#n4

Result is stored in data memory.

Logical

OR r, m

(r)

← (r) v (m)

OR operation is performed on contents of general register

operations

and data memory. Result is stored in general register.

OR m, #n4

(m)

← (m) v n4

OR operation is performed on immediate data and contents

of data memory. Result is stored in data memory.

Logical

AND r, m

(r)

← (r) (m)

AND operation is performed on contents of general register

AND

and data memory. Result is stored in general register.

AND m, #n4

(m)

← (m) n4

AND operation is performed on immediate data and contents

of data memory. Result is stored in data memory.

Logical

XOR r, m

(r)

← (r) v (m)

XOR operation is performed on contents of general register

XOR

and data memory. Result is stored in general register.

XOR m, #n4

(m)

← (m) v n4

XOR operation is performed on immediate data and contents

of data memory. Result is stored in data memory.

Bit

True

SKT m, #n

CMP

← 0, if (m) n=n,

Skips next instruction if all bits in data memory specified by

Judgement

then skip

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 specified by

then skip

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

Comparison Equal

SKE m, #n4

(m) – n4, skip if zero

Skips next instruction if immediate data equals contents of

judgement

data memory. Result is not stored.

Not equal

SKNE m,

(m) – n4, skip if not

Skips next instruction if immediate data is not equal to

#n4

zero

contents of data memory. Result is not stored.

≥

SKGE m,

(m) – n4, skip if not

Skips next instruction if contents of data memory is greater

#n4

borrow

than or equal to immediate data. Result is not stored.

SKLT m,

(m) – n4, skip if

Skips next instruction if contents of data memory is less

#n4

borrow

than immediate data. Result is not stored.

Rotation

Rotate to

RORC r

Rotate contents of the general register along with the CY

the right

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

→(r)b3→(r)b2→(r)b1→(r)b0

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