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Memory Chip
; This code is written for the PIC16F877A microcontroller
; It configures the device and communicates via SPI with a memory chip
__CONFIG _DEBUG_OFF & _CP_ALL & _WRT_HALF & _CPD_ON & _LVP_OFF & _BODEN_OFF & _PWRTE_ON & _WDT_OFF & _HS_OSC
; Configuration bits explanation:
; - Debug mode disabled
; - Code protection enabled
; - Half of the program memory can be rewritten online
; - EEPROM data protected
; - Low Voltage Programming disabled
; - Power Down Detection disabled
; - Power On Delay enabled
; - Watchdog Timer disabled
; - High-Speed oscillator (4MHz)
VALUE1 EQU 0F1H ; Data to be sent, 4 high bits (upper nibble is invalid)
VALUE2 EQU 0FCH ; Data to be sent, 6 low bits (lower two bits are invalid)
ORG 00H ; Reset vector address
NOP ; Required by ICD for proper debugging
MAIN
CLRF PORTC ; Clear all outputs on PORTC
BCF PORTC, 3 ; Pull down clock signal to enable chip select
BSF PORTC, 2 ; Enable chip select
BANKSEL TRISC ; Switch to TRISC register bank
CLRF TRISC ; Set PORTC as output
BSF TRISC, 4 ; Set RC4 as input (SDI line)
BANKSEL SSPSTAT ; Switch to SSPSTAT register
MOVLW '01000000' ; CKE = 1 (falling edge), according to TCL5615 specs
MOVWF SSPSTAT
CLRF STATUS ; Clear status register
MOVLW '00100000' ; Enable SPI, CKP=0 (master mode), Fosc/4
MOVWF SSPCON
BCF PORTC, 3 ; Pull down clock signal
BCF PORTC, 2 ; Enable chip select
MOVLW VALUE1 ; Send high 4 bits of data
MOVWF SSPBUF ; Load data into buffer
BTFSS PIR1, SSPIF ; Wait until transmission completes
GOTO $-1 ; Loop until done
BCF PIR1, SSPIF ; Clear interrupt flag
MOVFW SSPBUF ; Read received data (clear buffer)
MOVLW VALUE2 ; Send lower 6 bits of data
MOVWF SSPBUF ; Load into buffer
BTFSS PIR1, SSPIF ; Wait for transmission to finish
GOTO $-1 ; Loop until done
BCF PIR1, SSPIF ; Clear interrupt flag
BCF PORTC, 3 ; Pull down clock signal
BSF PORTC, 2 ; Disable chip select
NOP ; No operation (for timing)
GOTO $ ; Infinite loop
;*******************************************************
END ; End of program
This code sets up the PIC16F877A microcontroller for SPI communication with a memory chip. It initializes the SPI module, configures the necessary pins, sends two sets of data (one with 4 high bits and another with 6 low bits), and ensures that each transmission is completed before proceeding. The configuration settings ensure stable operation with a 4MHz crystal oscillator and disable unnecessary features like debug mode and watchdog timer. The code is designed for real-time applications where precise control over SPI communication is essential.
Press Brake Protection
BLPS laser safety protective device is designed for personal safety used on hydraulic bender.
The dynamic test technology it used has passed the Type 4 functional safety assessment by TUV, and get the national invention patent. The product reaches the advanced technological level of similar products.
BLPS laser safety device provides protection zone near the die tip of the bender to protect fingers and arms of the operator in close to the upper mold die tip. It is the most effective solution so far to preserves the safety and productivity of the bender.
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Jining Keli Photoelectronic Industrial Co.,Ltd , https://www.sdkelien.com