PIC17C42A-33I/PQ Microchip Technology, PIC17C42A-33I/PQ Datasheet - Page 51

• Manufacturer Part Number: PIC17C42A-33I/PQ
• Description: IC MCU OTP 2KX16 PWM 44-MQFP
• Manufacturer: Microchip Technology
• Series: PIC® 17Cr

Specifications of PIC17C42A-33I/PQ

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 33MHz
• Connectivity: UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: OTP
• Ram Size: 232 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-MQFP, 44-PQFP
• Processor Series: PIC17C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 232 B
• Interface Type: SCI, USART
• Maximum Clock Frequency: 33 MHz
• Number Of Programmable I/os: 33
• Number Of Timers: 8
• Operating Supply Voltage: 2.5 V to 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: - 40 C
• For Use With: AC164316 - MODULE SKT MPLAB PM3 44MQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Example 8-4 shows the sequence to do an 16 x 16
signed multiply. Equation 8-2 shows the algorithm that
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 8-2:
RES3:RES0
1996 Microchip Technology Inc.
= 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
8
8
16
)
)
)
16
16
) +
)
+
+
+
+
EXAMPLE 8-4:
;
;
;
;
;
SIGN_ARG1
;
CONT_CODE
MOVFP
MULWF
MOVPF
MOVPF
MOVFP
MULWF
MOVPF
MOVPF
MOVFP
MULWF
MOVFP
ADDWF
MOVFP
ADDWFC
CLRF
ADDWFC
MOVFP
MULWF
MOVFP
ADDWF
MOVFP
ADDWFC
CLRF
ADDWFC
BTFSS
GOTO
MOVFP
SUBWF
MOVFP
SUBWFB
BTFSS
GOTO
MOVFP
SUBWF
MOVFP
SUBWFB
:
ARG1L, WREG
ARG2L
PRODH, RES1 ;
PRODL, RES0 ;
ARG1H, WREG
ARG2H
PRODH, RES3 ;
PRODL, RES2 ;
ARG1L, WREG
ARG2H
PRODL, WREG ;
RES1, F
PRODH, WREG ;
RES2, F
WREG, F
RES3, F
ARG1H, WREG ;
ARG2L
PRODL, WREG ;
RES1, F
PRODH, WREG ;
RES2, F
WREG, F
RES3, F
ARG2H, 7
SIGN_ARG1
ARG1L, WREG ;
RES2
ARG1H, WREG ;
RES3
ARG1H, 7
CONT_CODE
ARG2L, WREG ;
RES2
ARG2H, WREG ;
RES3
16 x 16 SIGNED MULTIPLY
ROUTINE
PIC17C4X
; ARG1L * ARG2L ->
;
; ARG1H * ARG2H ->
;
; ARG1L * ARG2H ->
;
; Add cross
;
;
;
; ARG1H * ARG2L ->
;
; Add cross
;
;
;
; ARG2H:ARG2L neg?
; no, check ARG1
;
; ARG1H:ARG1L neg?
; no, done
;
PRODH:PRODL
PRODH:PRODL
PRODH:PRODL
PRODH:PRODL
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DS30412C-page 51