Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Uživatelský manuál stáhnout pdf (Strana 42)

5 INSTRUCTION SET

EPSON

S1C33 FAMILY C33 PE CORE MANUAL

5.10 Multiply Instructions

The instruction set of the C33 PE Core includes four multiplication instructions.

mlt.h 16 bits × 16 bits → 32 bits (signed)

mltu.h 16 bits × 16 bits → 32 bits (unsigned)

mlt.w 32 bits × 32 bits → 64 bits (signed)

mltu.w 32 bits × 32 bits → 64 bits (unsigned)

The data in the specified general-purpose registers (R0–R15) is used for the multiplier and the multiplicand,

respectively. For 16-bit multiplications, the 16 low-order bits in the specified register are used. The signed

multiplication instructions use the MSB in the multiplier and multiplicand as the sign bit.

The result of a 16-bit × 16-bit operation is loaded into the ALR. The result of a 32-bit × 32-bit operation is loaded

into the AHR and ALR, with the 32 high-order bits stored in the former and the 32 low-order bits stored in the

latter.

The C33 PE Core executes 16-bit × 16-bit multiplication in five cycle and 32-bit × 32-bit multiplication in seven

cycles.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 180 181

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Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Uživatelský manuál Strana 42