PIC16F1937-I/ML Microchip Technology, PIC16F1937-I/ML Datasheet - Page 28

• 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 _AD_DataReady BitVars,0
;++++++++++++
;
; ADD_FSRx_FILTER - Adds 32 bit value pointed to by FSR to NewFilter
; FSR must point to LEAST significant byte, FSR-3 is most significant
; two versions one for each FSR
;
ADD_FSR0_FILTER MACRO
;++++++++++++
;
; DIV_FILTER_BY2 - Divide NewFilter by 2
;
;
DIV_FILTER_BY2 MACRO
;++++++++++++
;
; MUL_NEWOLD_BY2 - Multiply OldValue and NewSample with 2
;
;
MUL_NEWOLD_BY2 MACRO
DS41375A-page 28
NewSample:4
OldFilter:4
NewFilter:4
FilterWeight:1
FilterCounter:1
UpdateCounter:1
AD_DataVal:3
Bitvars:1
ENDC
; 8 instructions
; add value pointed to by FSR to filter
moviw
ADDWF
moviw
addwfc
moviw
addwfc
moviw
addwfc
ENDM
; 4 instructions
; right shift filter value by 1 ( i.e. divide by 2 )
; divide by 2
LSRF
RRF NewFilter+1,F
RRF NewFilter+2,F
RRF NewFilter+3,F
ENDM
; 8 instructions
; right shift filter value by 1 ( i.e. divide by 2 )
; multiply old value with 2
LSLF
RLF OldFilter+2,F
NewFilter,F
OldFilter+3,F
0[INDF0]
NewFilter+3,F
-1[INDF0]
NewFilter+2,F
-2[INDF0]
NewFilter+1,F
-3[INDF0]
NewFilter,F
; 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 responce
; how often we want an global update
; the global update location
; add to filter sum lowest byte
; get next byte
; get next byte
; get msb
© 2009 Microchip Technology Inc.