PIC16F1937-I/P Microchip Technology, PIC16F1937-I/P Datasheet - Page 22

• Manufacturer Part Number: PIC16F1937-I/P
• Description: IC PIC MCU FLASH 512KX14 40-PDIP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1937-I/P

• Program Memory Type: FLASH
• Program Memory Size: 14KB (8K x 14)
• Package / Case: 40-DIP (0.600", 15.24mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 36
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: EUSART/MI2C/SPI
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• A/d Bit Size: 10 bit
• A/d Channels Available: 14
• Height: 4.95 mm
• Length: 53.21 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.8 V
• Width: 14.73 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

;++++++++++++
;
; MUL_NEWOLD_BY2 - Multiply OldValue and NewSample with 2
;
;
MUL_NEWOLD_BY2 MACRO
ORG 0x0000
; ** interupt routine for data collection
ORG 0x0004
INT
; cold start vector
INIT
DS41375A-page 22
BCF STATUS,C
; divide by 2
RRF NewFilter,F
RRF NewFilter+1,F
RRF NewFilter+2,F
RRF NewFilter+3,F
ENDM
; 10 instructions
; right shift filter value by 1 ( i.e. divide by 2 )
BCF STATUS,C
; multiply old value with 2
RLF OldFilter+3,F
RLF OldFilter+2,F
RLF OldFilter+1,F
RLF OldFilter,F
; multiply new value with 2
BCF STATUS,C
RLF NewSample+3,F
RLF NewSample+2,F
RLF NewSample+1,F
RLF NewSample,F
ENDM
GOTO
; get data from AD
CALL
; for each sample, copy to AD_NewValue
; and call filter once
CALL
RETFIE
; only 'dummy' code here
BCF _AD_DataReady
; Note, this will inilialize the filter to gradually use
; no filtering to 'full' filtering ( increase once for each sample )
;
MOVLW FILTER_WEIGHT
MOVWF FilterCounter
INIT
GET_AD_DATA
TWIST24
; clear carry
; clear carry
; clear carry
; not included !
; clear data ready flag
© 2009 Microchip Technology Inc.