參數(shù)資料
型號： PIC16F526T-I/ST
廠商： Microchip Technology
文件頁數(shù)： 118/122頁
文件大?。?/td> 0K
描述： IC PIC MCU FLASH 1KX12 14TSSOP
標(biāo)準(zhǔn)包裝： 2,500
系列： PIC® 16F
核心處理器： PIC
芯體尺寸： 8-位
速度： 20MHz
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 11
程序存儲器容量： 1.5KB（1K x 12）
程序存儲器類型： 閃存
RAM 容量： 67 x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 3x8b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 14-TSSOP（0.173"，4.40mm 寬）
包裝： 帶卷 (TR)
配用： ICE2000-ND - EMULATOR MPLAB-ICE 2000 POD
其它名稱： PIC16F526T-I/STTR
2009 Microchip Technology Inc.
DS39689F-page 95
PIC18F2221/2321/4221/4321 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
arguments, 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
μs27.6 μs69 μs
Hardware multiply
1
100 ns
400 ns
1
μs
8 x 8 signed
Without hardware multiply
33
91
9.1
μs36.4 μs91 μs
Hardware multiply
6
600 ns
2.4
μs6 μs
16 x 16 unsigned
Without hardware multiply
21
242
24.2
μs96.8 μs242 μs
Hardware multiply
28
2.8
μs
11.2
μs28 μs
16 x 16 signed
Without hardware multiply
52
254
25.4
μs
102.6
μs254 μs
Hardware multiply
35
40
4.0
μs16.0 μs40 μs
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PIC16F527-E/SO 制造商:Microchip Technology Inc 功能描述:1.5KB FLASH PROGRAM, 64B FLASH DATA, 8MHZ INTERNAL OSCILLATO - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 1.5KB FLASH 20SOIC
PIC16F527-I/ML 功能描述:8位微控制器 -MCU 8MHz Oscillator, 8b ADC 2x Comp, 2x Amps 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(shí)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(fēng)格:SMD/SMT
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