PIC18LF23K22-E/SO Microchip Technology, PIC18LF23K22-E/SO Datasheet - Page 111
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PIC18LF23K22-E/SO
Manufacturer Part Number
PIC18LF23K22-E/SO
Description
8KB, Flash, 768bytes-RAM,8-bit Family,nanoWatt XLP 28 SOIC .300in TUBE
Manufacturer
Microchip Technology
Series
PIC® XLP™ 18Fr
Datasheet
1.PIC18F26J13-ISS.pdf
(496 pages)
Specifications of PIC18LF23K22-E/SO
Core Processor
PIC
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
24
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 19x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
28-SOIC (0.300", 7.50mm Width)
Processor Series
PIC18LF
Core
PIC
3rd Party Development Tools
52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8.0
8.1
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
8.2
Example 8-1
unsigned multiplication. Only one instruction is required
when one of the arguments is already loaded in the
WREG register.
Example 8-2
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.
TABLE 8-1:
2010 Microchip Technology Inc.
8 x 8 unsigned
8 x 8 signed
16 x 16 unsigned
16 x 16 signed
Routine
8 x 8 HARDWARE MULTIPLIER
Introduction
Operation
shows the instruction sequence for an 8 x 8
shows the sequence to do an 8 x 8 signed
PERFORMANCE COMPARISON FOR VARIOUS MULTIPLY OPERATIONS
Without hardware multiply
Hardware multiply
Without hardware multiply
Hardware multiply
Without hardware multiply
Hardware multiply
Without hardware multiply
Hardware multiply
Multiply Method
Table
8-1.
Program
Memory
(Words)
Preliminary
13
33
21
28
52
35
1
6
Cycles
(Max)
242
254
69
91
28
40
EXAMPLE 8-1:
EXAMPLE 8-2:
1
6
MOVF
MULWF
MOVF
MULWF
BTFSC
SUBWF
MOVF
BTFSC
SUBWF
PIC18(L)F2X/4XK22
@ 64 MHz @ 40 MHz @ 10 MHz @ 4 MHz
62.5 ns
15.1 s
15.9 s
375 ns
4.3 s
5.7 s
1.8 s
2.5 s
ARG1, W
ARG2
ARG1, W
ARG2
ARG2, SB
PRODH, F
ARG2, W
ARG1, SB
PRODH, F
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
;
Time
102.6 s
27.6 s
36.4 s
96.8 s
16.0 s
11.2 s
400 ns
2.4 s
DS41412D-page 111
- ARG1
- ARG2
242 s
254 s
69 s
91 s
28 s
40 s
1 s
6 s
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