PIC18LF8520-I/PT Microchip Technology, PIC18LF8520-I/PT Datasheet - Page 87
PIC18LF8520-I/PT
Manufacturer Part Number
PIC18LF8520-I/PT
Description
IC MCU FLASH 16KX16 EEPROM80TQFP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC18F8520T-IPT.pdf
(380 pages)
3.PIC18F8520T-IPT.pdf
(16 pages)
4.PIC18F8520T-IPT.pdf
(40 pages)
5.PIC18F8520-IPT.pdf
(2 pages)
Specifications of PIC18LF8520-I/PT
Core Size
8-Bit
Program Memory Size
32KB (16K x 16)
Core Processor
PIC
Speed
40MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
68
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 16x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
80-TFQFP
Controller Family/series
PIC18
No. Of I/o's
68
Eeprom Memory Size
1024Byte
Ram Memory Size
2KB
Cpu Speed
40MHz
No. Of Timers
5
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Price
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- PIC16F616T-ISL PDF datasheet
- PIC18F8520T-IPT PDF datasheet #2
- PIC18F8520T-IPT PDF datasheet #3
- PIC18F8520T-IPT PDF datasheet #4
- PIC18F8520-IPT PDF datasheet #5
- Current page: 87 of 380
- Download datasheet (7Mb)
8.0
8.1
An 8 x 8 hardware multiplier is included in the ALU of
the PIC18FXX20 devices. 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 in the 16-bit product register
pair (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
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
enhanced devices using the single-cycle hardware
multiply and performing the same function without the
hardware multiply.
TABLE 8-1:
2004 Microchip Technology Inc.
8 x 8 unsigned
8 x 8 signed
16 x 16 unsigned
16 x 16 signed
algorithms
Routine
8 X 8 HARDWARE MULTIPLIER
Introduction
PIC18F6520/8520/6620/8620/6720/8720
PERFORMANCE COMPARISON
Without hardware multiply
Hardware multiply
Without hardware multiply
Hardware multiply
Without hardware multiply
Hardware multiply
Without hardware multiply
Hardware multiply
Multiply Method
Program
Memory
(Words)
13
33
21
28
52
35
1
6
8.2
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 Significant bit (MSb) is tested
and the appropriate subtractions are done.
EXAMPLE 8-1:
EXAMPLE 8-2:
MOVF
MULWF
MOVF
MULWF
BTFSC
SUBWF
MOVF
BTFSC
SUBWF
Cycles
(Max)
242
254
69
91
28
40
1
6
Operation
ARG1, W
ARG2
ARG1, W
ARG2
ARG2, SB
PRODH, F
ARG2, W
ARG1, SB
PRODH, F
@ 40 MHz
24.2 s
25.4 s
100 ns
600 ns
6.9 s
9.1 s
2.8 s
4.0 s
8 x 8 UNSIGNED
MULTIPLY ROUTINE
8 x 8 SIGNED MULTIPLY
ROUTINE
;
; ARG1 * ARG2 ->
; PRODH:PRODL
;
; ARG1 * ARG2 ->
; PRODH:PRODL
; Test Sign Bit
; PRODH = PRODH
;
;
; Test Sign Bit
; PRODH = PRODH
;
@ 10 MHz
102.6 s
27.6 s
36.4 s
96.8 s
11.2 s
16.0 s
Time
400 ns
2.4 s
- ARG1
- ARG2
DS39609B-page 85
@ 4 MHz
242 s
254 s
69 s
91 s
28 s
40 s
1 s
6 s
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