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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC17C752 датащи(PDF) 91 Page - Microchip Technology |
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PIC17C752 датащи(HTML) 91 Page - Microchip Technology |
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91 / 304 page  2000 Microchip Technology Inc. DS30289B-page 91 PIC17C7XX 10.9 PORTJ and DDRJ Registers (PIC17C76X only) PORTJ is an 8-bit wide, bi-directional port. The corre- sponding data direction register is DDRJ. A ’1’ in DDRJ configures the corresponding port pin as an input. A ’0’ in the DDRJ register configures the corresponding port pin as an output. Reading PORTJ reads the status of the pins, whereas writing to PORTJ will write to the respective port latch. PORTJ is a general purpose I/O port. EXAMPLE 10-9: INITIALIZING PORTJ FIGURE 10-19: PORTJ BLOCK DIAGRAM MOVLB 8 ; Select Bank 8 CLRF PORTJ, F ; Initialize PORTJ data ; latches before setting ; the data direction ; register MOVLW 0xCF ; Value used to initialize ; data direction MOVWF DDRJ ; Set RJ<3:0> as inputs ; RJ<5:4> as outputs ; RJ<7:6> as inputs Note: I/O pins have protection diodes to VDD and VSS. D CK Q D CK Q Data Bus RD_PORTJ WR_PORTJ RD_DDRJ WR_DDRJ EN Q D EN P N Q VDD |
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