PIC18C658-I/L Microchip Technology, PIC18C658-I/L Datasheet - Page 72

• Manufacturer Part Number: PIC18C658-I/L
• Description: IC PIC MCU OTP 16KX16 68PLCC
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C658-I/L

• Core Size: 8-Bit
• Program Memory Size: 32KB (16K x 16)
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: CAN, I²C, SPI, UART/USART
• Number Of I /o: 52
• 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: -40°C ~ 85°C
• Package / Case: 68-PLCC
• Controller Family/series: PIC18
• No. Of I/o's: 52
• Ram Memory Size: 1.5KB
• Cpu Speed: 40MHz
• No. Of Timers: 4
• Processor Series: PIC18C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 1536 B
• Interface Type: 3-Wire, I2C, SPI, USART, CAN
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 52
• Number Of Timers: 4 bit
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: ICE2000, DM163007, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164308 - MODULE SKT FOR PM3 68PLCCDVA18PQ640 - DEVICE ADAPT PIC18C658 64-TQFPAC174007 - MODULE SKT PROMATEII 68PLCC
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC18C658IL; Q1162292

6.1
Example 6-1 shows the sequence to perform 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 6-2 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 6-1:
EXAMPLE 6-2:
PIC18CXX8
MOVFF
MULWF
MOVFF
MULWF
BTFSC
SUBWF
MOVFF
BTFSC
SUBWF
DS30475A-page 72
Operation
ARG1, WREG
ARG2
ARG1, WREG
ARG2
ARG2, SB
PRODH, F
ARG2, WREG
ARG1, SB
PRODH, F
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
;
- ARG1
- ARG2
Advanced Information
Example 6-3 shows the sequence to perform a 16 x 16
unsigned multiply. Equation 6-1 shows the algorithm
that is used. The 32-bit result is stored in 4 registers
RES3:RES0.
EQUATION 6-1:
EXAMPLE 6-3:
RES3:RES0
;
;
;
MOVFF
MULWF
MOVFF
MOVFF
MOVFF
MULWF
MOVFF
MOVFF
MOVFF
MULWF
MOVF
ADDWF
MOVF
ADDWFC
CLRF
ADDWFC
MOVFF
MULWF
MOVF
ADDWF
MOVF
ADDWFC
CLRF
ADDWFC
=
=
ARG1L, WREG
ARG2L
PRODH, RES1
PRODL, RES0
ARG1H, WREG
ARG2H
PRODH, RES3
PRODL, RES2
ARG1L, WREG
ARG2H
PRODL, W
RES1, F
PRODH, W
RES2, F
WREG
RES3, F
ARG1H, WREG
ARG2L
PRODL, W
RES1, F
PRODH, W
RES2, F
WREG
RES3, F
ARG1H:ARG1L • ARG2H:ARG2L
(ARG1H • ARG2H • 2
(ARG1H • ARG2L • 2
(ARG1L • ARG2H • 2
(ARG1L • ARG2L)
16 x 16 UNSIGNED
MULTIPLY ROUTINE
16 x 16 UNSIGNED
MULTIPLICATION
ALGORITHM
 2000 Microchip Technology Inc.
; ARG1L * ARG2L ->
;
;
;
; ARG1H * ARG2H ->
;
;
;
; ARG1L * ARG2H ->
;
;
; Add cross
;
;
;
;
;
; ARG1H * ARG2L ->
;
;
; Add cross
;
;
;
;
PRODH:PRODL
PRODH:PRODL
PRODH:PRODL
PRODH:PRODL
products
products
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