PIC16F1937-I/ML Microchip Technology, PIC16F1937-I/ML Datasheet - Page 21

• Manufacturer Part Number: PIC16F1937-I/ML
• Description: IC PIC MCU FLASH 512KX14 44-QFN
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1937-I/ML

• Core Size: 8-Bit
• Program Memory Size: 14KB (8K x 14)
• Core Processor: PIC
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Type: FLASH
• 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
• Package / Case: 44-QFN
• Controller Family/series: PIC16F
• No. Of I/o's: 36
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 512Byte
• Cpu Speed: 32MHz
• No. Of Timers: 5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

#define UPDATE_COUNT
#define FILTER_WEIGHT
CBLOCK
#define _AD_DataReady BitVars,0
;++++++++++++
;
; ADD_FSR_FILTER - Adds 32 bit value pointed to by FSR to NewFilter
; FSR must point to LEAST significant byte, FSR-3 is most significant
;
ADD_FSR_FILTER MACRO
;++++++++++++
;
; DIV_FILTER_BY2 - Divide NewFilter by 2
;
;
DIV_FILTER_BY2 MACRO
© 2009 Microchip Technology Inc.
AD_NewValue:3
NewSample:4
OldFilter:4
NewFilter:4
FilterWeight:1
FilterCounter:1
UpdateCounter:1
AD_DataVal:3
Bitvars:1
ENDC
; 14-17 instructions
; add value pointed to by FSR to filter
; 5 instructions
; right shift filter value by 1 ( i.e. divide by 2 )
MOVF
ADDWF NewFilter+3,F
DECF
MOVF
SKPNC
INCFSZ INDF,W
ADDWF NewFilter+2,F
DECF
MOVF
SKPNC
INCFSZ INDF,W
ADDWF NewFilter+1,F
DECF
MOVF
SKPNC
INCFSZ INDF,W
ADDWF NewFilter,F
ENDM
0x020
FSR,F
INDF,W
FSR,F
INDF,W
FSR,F
INDF,W
INDF,W
0x20
0x80
; copy of AD_Newvalue, used locally
; previous value of filtering ( NewFilter from last run )
; the new filtered value
; how much weight that should be posed on old value
; to increase step response
; how often we want an global update
; the global update location
; get lowest byte
; add to filter sum lowest byte
; get next byte
;
; increase source
; and add to dest.
; get next byte
; get msb
if overflow
; 32 samples between global updates
; filterweight, i.e. 'A' in example above
DS41375A-page 21