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93LC56 Datasheet(PDF) 18 Page - Microchip Technology |
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93LC56 Datasheet(HTML) 18 Page - Microchip Technology |
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18 / 22 page  DS00560D-page 18 © 1994 Microchip Technology Inc. Using the 93LC56 and 93LC66 0125 0020 0800 retlw 0 ; 0126 0127 ;**************************************************************** 0128 ; Receive data routine 0129 ; This routine reads one byte of data from the part 0130 ; into the ‘datai’ register. 0131 ;**************************************************************** 0132 RX 0133 0021 006D clrf datai ; clear input buffer 0134 0022 0C08 movlw .8 ; set # bits to 8 0135 0023 0031 movwf count 0136 0024 0403 bcf status,0 ; make sure carry bit is low 0137 0025 036D RXLP rlf datai ; rotate the buffer left 1 bit 0138 0026 091A call BITIN ; read 1 bit 0139 0027 040D bcf datai,0 ; assume the input bit was low 0140 0028 06EA btfsc eeprom,di ; check the bit 0141 0029 050D bsf datai,0 ; set high if necessary 0142 002A 02F1 decfsz count ; 8 bits done? 0143 002B 0A25 goto RXLP ; no, do another 0144 002C 0800 retlw 0 0145 ; 0146 ;************************************************************* 0147 ; BITOUT routine 0148 ; This routine takes one bit of data in ‘do’ and 0149 ; transmits it to the serial EE device 0150 ;************************************************************* 0151 BITOUT 0152 002D 07CA btfss eeprom,do ; check state of data bit 0153 002E 0A31 goto bitlow ; low, goto bitlow 16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:20 1994 Page 4 Line PC Opcode 0154 002F 05C6 bsf port_b,datin ; high, set datain high 0155 0030 0A32 goto clkout ; and clock it 0156 ; 0157 0031 04C6 bitlow bcf port_b,datin ; output a logic low 0158 0032 05A6 clkout bsf port_b,sclk ; set clock line high 0159 0033 0000 nop 0160 0034 04A6 bcf port_b,sclk ; return clock line low 0161 0035 0800 retlw 0 0162 ; 0163 ;**************************************************************** 0164 ; Transmit Data Subroutine 0165 ; This routine takes the byte of data stored in the 0166 ; ‘datao’ register and transmits it to the serial EE device. 0167 ;**************************************************************** 0168 TX 0169 0036 0212 movf bits,w ; set the number of bits to xmit 0170 0037 0031 movwf count 0171 ; 0172 TXLP 0173 0038 04CA bcf eeprom,do ; assume bit 7 is low 0174 0039 06F0 btfsc txbuf,7 ; is bit 7 clear? 0175 003A 05CA bsf eeprom,do ; no, set data bit =1 0176 003B 092D call BITOUT ; transmit 1 bit to serial EE 0177 003C 0370 rlf txbuf ; rotate txbuf left 0178 003D 02F1 decfsz count ; all bits done? 0179 003E 0A38 goto TXLP ; no, do another bit 0180 003F 0800 retlw 0 ; yes, jump out 0181 ; 0182 ;**************************************************************** 0183 ; POWER-UP ROUTINE 0184 ; This is the program entry point, which in this case simply 0185 ; sets the port_a I/O lines and directs control to the 0186 ; erase/write enable routine. 0187 ;***************************************************************** 0188 PWRUP 8-116 |
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