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SPEAR320S-2 数据表(PDF) 61 Page - STMicroelectronics |
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SPEAR320S-2 数据表(HTML) 61 Page - STMicroelectronics |
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61 / 113 page  SPEAr320S Pin description Doc ID 022508 Rev 2 61/113 Table 30. SPP signals description Signal name Description Dir. PL_GPIO_# /Ball Configuration mode SPP_ACKn The peripheral pulses this line low when it has received the previous data and is ready to receive more data. The rising edge of SPP_ACKn can be enabled to interrupt the host. O PL_GPIO_76/F13 4, Extended SPP_AUTOFDn Usage of this line varies. Most printers will perform a line feed after each carriage return when this line is low, and carriage returns only when this line is high. I PL_GPIO_72/B16 4, Extended SPP_BUSY The peripheral drives this signal high to indicate that it is not ready to receive data. O PL_GPIO_75/E14 4, Extended SPP_DATA0 SPP unidirectional data lines O PL_GPIO_85/F15 4, Extended SPP_DATA1 PL_GPIO_84/D17 4, Extended SPP_DATA2 PL_GPIO_83/E16 4, Extended SPP_DATA3 PL_GPIO_82/E15 4, Extended SPP_DATA4 PL_GPIO_81/C17 4, Extended SPP_DATA5 PL_GPIO_80/D16 4, Extended SPP_DATA6 PL_GPIO_79/F14 4, Extended SPP_DATA7 PL_GPIO_78/D15 4, Extended SPP_FAULTn Usage of this line varies. Peripherals usually drive this line low when an error condition exists. O PL_GPIO_71/D14 4, Extended SPP_INITn This line is held low for a minimum of 50 µs to reset the printer and clear the print buffer. I PL_GPIO_70/C15 4, Extended SPP_PERROR Usage of this line varies. Printers typically drive this signal high during a paper empty condition. O PL_GPIO_74/C16 4, Extended SPP_SELECT The peripheral drives this signal high when it is selected and ready for data transfer. O PL_GPIO_73/A17 4, Extended SPP_SELINn The host drives this line low to select the peripheral. I PL_GPIO_69/A16 4, Extended SPP_STRBn Data is valid during an active low pulse on this line. I PL_GPIO_77/B17 4, Extended |
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