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参数资料
型号： PIC18LF96J65-I/PT
厂商： Microchip Technology
文件页数： 32/131页
文件大小： 0K
描述： IC PIC MCU FLASH 48KX16 100TQFP
标准包装： 90
系列： PIC® 18F
核心处理器： PIC
芯体尺寸： 8-位
速度： 41.667MHz
连通性： EBI/EMI，以太网，I²C，SPI，UART/USART
外围设备： 欠压检测/复位，POR，PWM，WDT
输入/输出数： 70
程序存储器容量： 96KB（48K x 16）
程序存储器类型： 闪存
RAM 容量： 3808 x 8
电压 - 电源 (Vcc/Vdd)： 2 V ~ 3.6 V
数据转换器： A/D 16x10b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 100-TQFP
包装： 托盘
2011 Microchip Technology Inc.
DS39762F-page 127
PIC18F97J60 FAMILY
9.0
8 x 8 HARDWARE MULTIPLIER
9.1
Introduction
All PIC18 devices include an 8 x 8 hardware multiplier
as part of the ALU. The multiplier performs an unsigned
operation and yields a 16-bit result that is stored in the
product register pair, PRODH:PRODL. The multiplier’s
operation does not affect any flags in the STATUS
register.
Making multiplication a hardware operation allows it to
be completed in a single instruction cycle. This has the
advantages of higher computational throughput and
reduced code size for multiplication algorithms and
allows the PIC18 devices to be used in many applica-
tions previously reserved for digital signal processors.
A comparison of various hardware and software
multiply operations, along with the savings in memory
and execution time, is shown in Table 9-1.
9.2
Operation
Example 9-1 shows the instruction sequence for an 8 x 8
unsigned multiplication. Only one instruction is required
when one of the arguments is already loaded in the
WREG register.
Example 9-2 shows the sequence to do an 8 x 8 signed
multiplication. To account for the sign bits of the argu-
ments, each argument’s Most Significant bit (MSb) is
tested and the appropriate subtractions are done.
EXAMPLE 9-1:
8 x 8 UNSIGNED
MULTIPLY ROUTINE
EXAMPLE 9-2:
8 x 8 SIGNED MULTIPLY
ROUTINE
TABLE 9-1:
PERFORMANCE COMPARISON FOR VARIOUS MULTIPLY OPERATIONS
MOVF
ARG1, W
;
MULWF
ARG2
; ARG1 * ARG2 ->
; PRODH:PRODL
MOVF
ARG1, W
MULWF
ARG2
; ARG1 * ARG2 ->
; PRODH:PRODL
BTFSC
ARG2, SB
; Test Sign Bit
SUBWF
PRODH, F
; PRODH = PRODH
;
- ARG1
MOVF
ARG2, W
BTFSC
ARG1, SB
; Test Sign Bit
SUBWF
PRODH, F
; PRODH = PRODH
;
- ARG2
Routine
Multiply Method
Program
Memory
(Words)
Cycles
(Max)
Time
@ 40 MHz
@ 10 MHz
@ 4 MHz
8 x 8 unsigned
Without hardware multiply
13
69
6.9
s27.6 s69 s
Hardware multiply
1
100 ns
400 ns
1
s
8 x 8 signed
Without hardware multiply
33
91
9.1
s36.4 s91 s
Hardware multiply
6
600 ns
2.4
s6 s
16 x 16 unsigned
Without hardware multiply
21
242
24.2
s96.8 s242 s
Hardware multiply
28
2.8
s
11.2
s28 s
16 x 16 signed
Without hardware multiply
52
254
25.4
s
102.6
s254 s
Hardware multiply
35
40
4.0
s16.0 s40 s
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