PIC17C752 MICROCHIP [Microchip Technology], PIC17C752 Datasheet - Page 61
PIC17C752
Manufacturer Part Number
PIC17C752
Description
High-Performance 8-Bit CMOS EPROM Microcontrollers
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC17C752.pdf
(320 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC17C752-16/L
Manufacturer:
Microchip
Quantity:
120
Company:
Part Number:
PIC17C752-16/L
Manufacturer:
Microchip Technology
Quantity:
10 000
Company:
Part Number:
PIC17C752-16/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
Company:
Part Number:
PIC17C752-16E/L
Manufacturer:
Microchip Technology
Quantity:
10 000
Company:
Part Number:
PIC17C752-16E/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
Company:
Part Number:
PIC17C752-16I/L
Manufacturer:
Microchip Technology
Quantity:
10 000
Company:
Part Number:
PIC17C752-33/L
Manufacturer:
Microchip
Quantity:
304
Part Number:
PIC17C752-33I/L
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
Company:
Part Number:
PIC17C752-ES
Manufacturer:
Microchip
Quantity:
18
- Current page: 61 of 320
- Download datasheet (3Mb)
9.0
All PIC17C75X devices have an 8 x 8 hardware multi-
plier 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 flags 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 algo-
The performance increase allows the device to be used
in applications previously reserved for Digital Signal
Processors.
Table 9-1 shows a performance comparison between
PIC17CXXX devices using the single cycle hardware
multiply, and performing the same function without the
hardware multiply.
Example 9-1 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.
TABLE 9-1:
8 x 8 unsigned
8 x 8 signed
16 x 16 unsigned
16 x 16 signed
1997 Microchip Technology Inc.
rithms
Routine
HARDWARE MULTIPLIER
PERFORMANCE COMPARISON
Without hardware multiply
Hardware multiply
Without hardware multiply
Hardware multiply
Without hardware multiply
Hardware multiply
Without hardware multiply
Hardware multiply
Multiply Method
Preliminary
Program Memory
Example 9-2 shows the sequence to do an 8 x 8 signed
multiply. To account for the sign bits of the arguments,
each argument’s most significant bit (MSb) is tested
and the appropriate subtractions are done.
EXAMPLE 9-1:
EXAMPLE 9-2:
(Words)
13
21
24
52
36
—
1
6
MOVFP
MULWF
MOVFP
MULWF
BTFSC
SUBWF
MOVFP
BTFSC
SUBWF
ARG1, WREG
ARG2
ARG1, WREG
ARG2
ARG2, SB
PRODH, F
ARG2, WREG
ARG1, SB
PRODH, F
Cycles (Max)
8 x 8 UNSIGNED MULTIPLY
ROUTINE
8 x 8 SIGNED MULTIPLY
ROUTINE
242
254
69
24
36
—
1
6
;
; ARG1 * ARG2 ->
;
; ARG1 * ARG2 ->
;
; Test Sign Bit
; PRODH = PRODH
;
; Test Sign Bit
; PRODH = PRODH
;
DS30264A-page 61
PRODH:PRODL
PRODH:PRODL
@ 33 MHz
29.333 s
30.788 s
8.364 s
0.121 s
0.727 s
2.91 s
4.36 s
Time
—
- ARG1
- ARG2
Related parts for PIC17C752
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
IC, 8BIT MCU, PIC17C, 16MHZ, DIP-40
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC, 8BIT MCU, PIC17C, 33MHZ, PLCC-64
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
Part Number:
Description:
28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
Part Number:
Description:
Low-Cost NV Digital POT with WiperLock Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
Part Number:
Description:
28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
Part Number:
Description:
8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
Part Number:
Description:
8-Pin Flash Microcontrollers with nanoWatt XLP Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
Part Number:
Description:
500mA Fixed Output CMOS LDO with Shutdown
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
Part Number:
Description:
500mA Fixed Output, Fast Response CMOS LDO with Shutdown
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
Part Number:
Description:
1.5A Dual Open-Drain MOSFET Drivers
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
Part Number:
Description:
1.5A DUAL HIGH-SPEED POWER MOSFET DRIVERS
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
Part Number:
Description:
Single/Dual Digital Potentiometer with SPI Interface
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet: