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ST78C34 데이터시트(PDF) 8 Page - Exar Corporation |
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ST78C34 데이터시트(HTML) 8 Page - Exar Corporation |
8 / 21 page 6-10 ST78C34 Rev. 3.00 COM BIT-2: INIT input pin. 0= INIT pin is in low state 1= INIT pin is in high state COM BIT-3: -SLCTIN input pin. 0= -SLCTIN pin is in high state 1= -SLCTIN pin is in low state COM BIT-4: Interrupt mask. 0= Interrupt (INT output) is disabled 1= Interrupt (INT output) is enabled COM BIT 7-5: Not used. Are set to “1” permanently. CONTROL REGISTER. Writing to this register will set the state of the - STROBE, -AUTOFDXT, INIT, SLCTIN pins, and in- terrupt mask register. CON BIT-0: -STROBE output control bit. 0= -STROBE output is set to high state 1= -STROBE output is set to low state CON BIT-1: -AUTOFDXT output control bit. 0= -AUTOFDXT output is set to high state 1= -AUTOFDXT output is set to low state CON BIT-2: INIT output control bit. 0= INIT output is set to low state 1= INIT output is set to high state CON BIT-3: -SLCTIN output control bit. 0= -SLCTIN output is set to high state 1= -SLCTIN output is set to low state CON BIT-4: Interrupt output control bit. 0= INT output is disabled (three state mode) 1= INT output is enabled CON BIT-5: I/O select. Direction of the PD7-PD0 can be selected by setting or clearing this bit. 0= PD7-PD0 are set for output mode 1= PD7-PD0 are set for input mode CON BIT 7-6: Not used. ALTERNATE FUNCTION REGISTER (AFR) This register En/Disables FIFO operation and pro- vides additional capabilities to control -STROBE. INT and change interrupt functions. AFR BIT 0-2: Timing select. The -STROBE delay and width can be controlled by these bits. AFR AFR AFR TSD TSW Bit-2 Bit-1 Bit-0 (clocks) (clocks) 100 3 2 101 5 4 110 5 4 111 9 8 000 6 4 001 10 8 010 10 8 0 1 1 18 16 AFR BIT-3: Interrupt source. 0= -ACK input pin is selected as printer handshaking source 1= BUSY input pin is selected as printer handshaking source AFR BIT 4-5: Interrupt type. State of the INT output pin can be selected for one of the following options. |
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