參數(shù)資料
型號： PIC17C44
元件分類： 外設(shè)及接口
英文描述： Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C
中文描述： 電可擦除可編程邏輯器件
文件頁數(shù)： 44/71頁
文件大?。?/td> 1173K
代理商： PIC17C44
1996 Microchip Technology Inc.
DS30412C-page 49
PIC17C4X
8.0
HARDWARE MULTIPLIER
All PIC17C4X devices except the PIC17C42, have an
8 x 8 hardware multiplier included in the ALU of the
device. By making the multiply a hardware operation, it
completes in a single instruction cycle. This is an
unsigned multiply that gives a 16-bit result. The result
is
stored
into
the
16-bit
PRODuct
register
(PRODH:PRODL). The multiplier does not affect any
ags in the ALUSTA register.
Making the 8 x 8 multiplier execute in a single cycle
gives the following advantages:
Higher computational throughput
Reduces code size requirements for multiply
algorithms
The performance increase allows the device to be used
in applications previously reserved for Digital Signal
Processors.
Table 8-1 shows a performance comparison between
the PIC17C42 and all other PIC17CXX devices, which
have the single cycle hardware multiply.
Example 8-1 shows the sequence to do an 8 x 8
unsigned multiply. Only one instruction is required
when one argument of the multiply is already loaded in
the WREG register.
Example 8-2 shows the sequence to do an 8 x 8 signed
multiply. To account for the sign bits of the arguments,
each argument’s most signicant bit (MSb) is tested
and the appropriate subtractions are done.
EXAMPLE 8-1:
8 x 8 MULTIPLY ROUTINE
MOVFP
ARG1, WREG
MULWF
ARG2
; ARG1 * ARG2 ->
;
PRODH:PRODL
EXAMPLE 8-2:
8 x 8 SIGNED MULTIPLY
ROUTINE
MOVFP
ARG1, WREG
MULWF
ARG2
; ARG1 * ARG2 ->
;
PRODH:PRODL
BTFSC
ARG2, SB
; Test Sign Bit
SUBWF
PRODH, F
; PRODH = PRODH
;
- ARG1
MOVFP
ARG2, WREG
BTFSC
ARG1, SB
; Test Sign Bit
SUBWF
PRODH, F
; PRODH = PRODH
;
- ARG2
TABLE 8-1:
PERFORMANCE COMPARISON
Routine
Device
Program Memory
(Words)
Cycles (Max)
Time
@ 25 MHz
@ 33 MHz
8 x 8 unsigned
PIC17C42
13
69
11.04
s
N/A
All other PIC17CXX devices
1
160 ns
121 ns
8 x 8 signed
PIC17C42
—
N/A
All other PIC17CXX devices
6
960 ns
727 ns
16 x 16 unsigned
PIC17C42
21
242
38.72
s
N/A
All other PIC17CXX devices
24
3.84
s
2.91
s
16 x 16 signed
PIC17C42
52
254
40.64
s
N/A
All other PIC17CXX devices
36
5.76
s
4.36
s
This document was created with FrameMaker404
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC17C44/JW 功能描述:8位微控制器 -MCU 16KB 454 RAM 33 I/O 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(fēng)格:SMD/SMT
PIC17C44-16/L 功能描述:8位微控制器 -MCU 16KB 454 RAM 33 I/O 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(fēng)格:SMD/SMT
PIC17C44-16/P 功能描述:8位微控制器 -MCU 16KB 454 RAM 33 I/O 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(fēng)格:SMD/SMT
PIC17C44-16/P 制造商:Microchip Technology Inc 功能描述:IC 8-BIT CMOS MCU OTP ((NS))
PIC17C44-16/PQ 功能描述:8位微控制器 -MCU 16KB 454 RAM 33 I/O 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(fēng)格:SMD/SMT
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