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SN8F2288 Datasheet(PDF) 82 Page - SONiX Technology Company |
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SN8F2288 Datasheet(HTML) 82 Page - SONiX Technology Company |
82 / 163 page SN8F2280 Series USB 2.0 Full-Speed 8-Bit Micro-Controller 7.3 I/O OPEN-DRAIN REGISTER P1.0/P1.1/P0.6/P0.5 is built-in open-drain function. P1.0/P1.1/P0.6/P0.5 must be set as output mode when enable P1.0/P1.1/P0.6/P0.5 open-drain function. Open-drain external circuit is as following. U MCU2 U VCC Open-drain pin Open-drain pin MCU1 Pull-up Resistor The pull-up resistor is necessary. Open-drain output high is driven by pull-up resistor. Output low is sunken by MCU’s pin. 0E9H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 P1OC - - - - P06OC P05OC P11OC P10OC Read/Write - - - - W W W W After reset - - - - 0 0 0 0 Bit [3:2] P0nOC: Port 0 open-drain control bit 0 = Disable open-drain mode 1 = Enable open-drain mode Bit [1:0] P1nOC: Port 1 open-drain control bit 0 = Disable open-drain mode 1 = Enable open-drain mode Example: Enable P1.0 to open-drain mode and output high. B0BSET P1.0 ; Set P1.0 buffer high. B0BSET P10M ; Enable P1.0 output mode. MOV A, #01H ; Enable P1.0 open-drain function. B0MOV P1OC, A Note: P1OC is write only register. Setting P10OC must be used “MOV” instructions. Example: Disable P1.0 to open-drain mode and output low. MOV A, #0 ; Disable P1.0 open-drain function. B0MOV P1OC, A Note: After disable P1.0 open-drain function, P1.0 mode returns to last I/O mode. SONiX TECHNOLOGY CO., LTD Page 82 Version 1.1 |
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