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| 型号： | PIC17C44 |
| 元件分类： | 外设及接口 |
| 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： | 电可擦除可编程逻辑器件 |
| 文件页数： | 44/71页 |
| 文件大小： | 1173K |
| 代理商： | PIC17C44 |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格: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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格: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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格: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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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