HD64F2145 datasheet(85/829 Pages) RENESAS

85 / 829 page

Rev. 2.0, 08/02, page 45 of 788

Table 2.4

Arithmetic Operations Instructions (2)

Instruction

Size*

Function

DIVXS

B/W

÷ Rs → Rd

Performs signed division on data in two general registers: either 16 bits

8 bits

→ 8-bit quotient and 8-bit remainder or 32 bits ÷ 16 bits → 16-bit

quotient and 16-bit remainder.

CMP

B/W/L

Rd – Rs, Rd – #IMM

Compares data in a general register with data in another general register

or with immediate data, and sets the CCR bits according to the result.

NEG

B/W/L

0 – Rd

→ Rd

Takes the two's complement (arithmetic complement) of data in a

general register.

EXTU

W/L

Rd (zero extension)

→ Rd

Extends the lower 8 bits of a 16-bit register to word size, or the lower 16

bits of a 32-bit register to longword size, by padding with zeros on the

left.

EXTS

W/L

Rd (sign extension)

→ Rd

Extends the lower 8 bits of a 16-bit register to word size, or the lower 16

bits of a 32-bit register to longword size, by extending the sign bit.

TAS*

@ERd – 0, 1

→ (<bit 7> of @ERd)

Tests memory contents, and sets the most significant bit (bit 7) to 1.

Notes: 1. Size refers to the operand size.

B: Byte

W: Word

L: Longword

2. When using the TAS instruction, use registers ER0, ER1, ER4 and ER5.

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