Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Uživatelský manuál stáhnout pdf (Strana 61)

MAXQ Family User’s Guide:

MAXQ2010 Supplement

12-1

ADDENDUM TO SECTION 12: HARDWARE MULTIPLIER MODULE

The MAXQ2010 provides a hardware multiplier module that provides the following features (detailed in the MAXQ

Family User’s Guide):

• Completes a 16-bit x 16-bit multiply-accumulate or multiply-subtract operation in a single cycle

• Includes 48-bit accumulator

• Supports seven different multiplication operations

Unsigned 16-bit multiply

Unsigned 16-bit multiply and accumulate

Unsigned 16-bit multiply and subtract

Signed 16-bit multiply

Signed 16-bit multiply and negate

Signed 16-bit multiply and accumulate

Signed 16-bit multiply and subtract

12.1 Hardware Multiplier Control Registers

The associated registers for this module are listed in Table 12-1.

Table 12-1. Hardware Multiplier Control Registers

12.2 Hardware Multiplier Code Examples

12.2.1 Hardware Multiplier Example: Multiply and Square/Accumulate

move MCNT,#021h ; Unsigned multiply, no accumulate

move MA, #00155h

move MB, #000AAh ; MC[2:0] = 00_0000_E272h

move MCNT,#012h ; Square single operand and accumulate

move MA, #000FFh ; MC[2:0] = 00_0001_E073h

move MB, #00099h ; MC[2:0] = 00_0002_3BE4h

MCNT M2[00h] Multiplier Control Register. Controls the operation and mode selection for the multiplier.

MA M2[01h] Multiplier Operand A Register. Input register for the multiplier operations.

MB M2[02h] Multiplier Operand B Register. Input register for the multiplier operations.

MC2 M2[03h] Multiplier Accumulate Register 2. Contains bits 32 to 47 of the accumulator.

MC1 M2[04h] Multiplier Accumulate Register 1. Contains bits 16 to 31 of the accumulator.

MC0 M2[05h] Multiplier Accumulate Register 0. Contains bits 0 to 15 of the accumulator.

MC1R M2[08h] Multiplier Read Register 1. Contains bits 16 to 31 of the last multiply operation result.

MC0R M2[09h] Multiplier Read Register 0. Contains bits 0 to 15 of the last multiply operation result.

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 146 147

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Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Uživatelský manuál Strana 61