參數(shù)資料
型號： P89LPC9171FDH,129
廠商： NXP Semiconductors
文件頁數(shù)： 23/27頁
文件大?。?/td> 0K
描述： IC 80C51 MCU FLASH 2KB 16TSSOP
標準包裝： 96
系列： LPC900
核心處理器： 8051
芯體尺寸： 8-位
速度： 18MHz
連通性： I²C，UART/USART
外圍設備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 14
程序存儲器容量： 2KB（2K x 8）
程序存儲器類型： 閃存
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 2.4 V ~ 3.6 V
數(shù)據(jù)轉換器： A/D 4x8b; D/A 1x8b
振蕩器型： 內部
工作溫度： -40°C ~ 85°C
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
包裝： 管件
其它名稱： 935290262129
2010 Microchip Technology Inc.
Preliminary
DS39979A-page 87
PIC18F87J72 FAMILY
8.0
8 x 8 HARDWARE MULTIPLIER
8.1
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 8-1.
8.2
Operation
Example 8-1 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 8-2 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 8-1:
8 x 8 UNSIGNED MULTIPLY
ROUTINE
EXAMPLE 8-2:
8 x 8 SIGNED MULTIPLY
ROUTINE
TABLE 8-1:
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
@ 48 MHz
@ 10 MHz
@ 4 MHz
8 x 8 unsigned
Without hardware multiply
13
69
5.7
s27.6 s69 s
Hardware multiply
1
83.3 ns
400 ns
1
s
8 x 8 signed
Without hardware multiply
33
91
7.5
s36.4 s91 s
Hardware multiply
6
500 ns
2.4
s6 s
16 x 16 unsigned
Without hardware multiply
21
242
20.1
s96.8 s242 s
Hardware multiply
28
2.3
s
11.2
s28 s
16 x 16 signed
Without hardware multiply
52
254
21.6
s
102.6
s254 s
Hardware multiply
35
40
3.3
s16.0 s40 s
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相關代理商/技術參數(shù)
參數(shù)描述
P89LPC917FDH 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 2K FLASH TSSOP16 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 2K FLASH, TSSOP16
P89LPC917FDH,129 功能描述:8位微控制器 -MCU 80C51 2K FL 256B RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
P89LPC917FDH129 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 18MHZ TSSOP-16
P89LPC917FDH-S 制造商:NXP Semiconductors 功能描述:MCU 8-bit P89 80C51 CISC 2KB Flash 2.5V/3.3V 16-Pin TSSOP
P89LPC920 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM
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