PIC18C658/CL Microchip Technology, PIC18C658/CL Datasheet - Page 73
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PIC18C658/CL
Manufacturer Part Number
PIC18C658/CL
Description
IC MCU OTP 16KX16 CAN 68-PLCC
Manufacturer
Microchip Technology
Series
PIC® 18Cr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16C770-ISO.pdf
(8 pages)
3.PIC18C658-IPT.pdf
(366 pages)
4.PIC18C658-IPT.pdf
(16 pages)
5.PIC18C658-IPT.pdf
(16 pages)
6.PIC18C658-IPT.pdf
(16 pages)
Specifications of PIC18C658/CL
Core Processor
PIC
Core Size
8-Bit
Speed
40MHz
Connectivity
CAN, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
52
Program Memory Size
32KB (16K x 16)
Program Memory Type
OTP
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
68-PLCC
For Use With
AC164308 - MODULE SKT FOR PM3 68PLCCDVA18PQ640 - DEVICE ADAPT PIC18C658 64-TQFP
Lead Free Status / RoHS Status
Request inventory verification / Request inventory verification
Eeprom Size
-
Other names
Q1068347
- PIC16F616T-ISL PDF datasheet
- PIC16C770-ISO PDF datasheet #2
- PIC18C658-IPT PDF datasheet #3
- PIC18C658-IPT PDF datasheet #4
- PIC18C658-IPT PDF datasheet #5
- PIC18C658-IPT PDF datasheet #6
- Current page: 73 of 366
- Download datasheet (7Mb)
Example 6-4 shows the sequence to perform an 16 x
16 signed multiply. Equation 6-2 shows the algorithm
used. The 32-bit result is stored in four registers
RES3:RES0. To account for the sign bits of the argu-
ments, each argument pairs most significant bit (MSb)
is tested and the appropriate subtractions are done.
EQUATION 6-2:
2000 Microchip Technology Inc.
RES3:RES0
=
=
ARG1H:ARG1L • ARG2H:ARG2L
(ARG1H • ARG2H • 2
(ARG1H • ARG2L • 2
(ARG1L • ARG2H • 2
(ARG1L • ARG2L)
(-1 • ARG2H<7> • ARG1H:ARG1L • 2
(-1 • ARG1H<7> • ARG2H:ARG2L • 2
16 x 16 SIGNED
MULTIPLICATION
ALGORITHM
16
8
8
)
)
)
+
+
+
+
Advanced Information
16
16
)
)
+
EXAMPLE 6-4:
;
;
;
;
;
SIGN_ARG1
;
CONT_CODE
BTFSS
MULWF
MULWF
MULWF
MOVFF
MOVFF
MOVFF
MOVFF
MOVFF
MOVFF
MOVFF
MULWF
MOVF
ADDWF
MOVF
ADDWFC
CLRF
ADDWFC
MOVFF
MOVF
ADDWF
MOVF
ADDWFC
CLRF
ADDWFC
GOTO
MOVFF
SUBWF
MOVFF
SUBWFB
BTFSS
GOTO
MOVFF
SUBWF
MOVFF
SUBWFB
:
ARG2H, 7
ARG2L
ARG2H
ARG2L
ARG2H
ARG1H, 7
ARG1L, WREG
PRODH, RES1
PRODL, RES0
ARG1H, WREG
PRODH, RES3
PRODL, RES2
ARG1L, WREG
PRODL, W
RES1, F
PRODH, W
RES2, F
WREG
RES3, F
ARG1H, WREG
PRODL, W
RES1, F
PRODH, W
RES2, F
WREG
RES3, F
SIGN_ARG1
ARG1L, WREG
RES2
ARG1H, WREG
RES3
CONT_CODE
ARG2L, WREG
RES2
ARG2H, WREG
RES3
16 x 16 SIGNED MULTIPLY
ROUTINE
PIC18CXX8
; ARG1H:ARG1L neg?
; ARG1L * ARG2H ->
; ARG2H:ARG2L neg?
; ARG1L * ARG2L ->
;
;
;
; ARG1H * ARG2H ->
;
;
;
;
; Add cross
;
;
;
;
; ARG1H * ARG2L ->
;
; Add cross
;
;
;
; no, check ARG1
;
;
;
; no, done
;
;
;
;
;
;
;
DS30475A-page 73
PRODH:PRODL
PRODH:PRODL
PRODH:PRODL
PRODH:PRODL
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