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ST10F296 数据表(PDF) 144 Page - STMicroelectronics |
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ST10F296 数据表(HTML) 144 Page - STMicroelectronics |
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144 / 346 page  Obsolete Product(s) - Obsolete Product(s) Parallel ports ST10F296E 144/346 13.6.2 Alternate functions of Port 4 During external bus cycles that use segmentation (for address space above 64 Kbytes) a number of Port 4 pins may output the segment address lines. The number of pins that are used for segment address output determines the external address space which is directly accessible. The other pins of Port 4 (if any) may be used for general purpose I/O. If segment address lines are selected, the alternate function of Port 4 may be required to access external memory directly after reset. Consequently, Port 4 is switched to this alternate function automatically. The number of segment address lines is selected via Port 0 during reset. The selected value can be read from the bit-field, SALSEL, in register RP0H (a read-only register) to check configuration during run time. The CAN interfaces use two or four pins of Port 4 to interface the CAN module to the external CAN transceiver. In this case the number of possible segment address lines is reduced. The case is the same when the I2C interface module is used. Table 84 summarizes the alternate functions of Port 4 depending on the number of selected segment address lines (coded via bit-field SALSEL). . Table 84. Port 4 alternate functions Port 4 Standard function SALSEL = 01 64 Kbytes Alternate function SALSEL = 11 256 Kbytes Alternate function SALSEL = 00 1 Mbyte Alternate function SALSEL = 10(1)(2) 16 Mbytes 1. When SALSEL = 10, CAN1 and CAN2 cannot be used and the external memory has a higher priority on the CAN alternate functions. Once the I2C is enabled, P4.4 and P4.7 are dedicated to it and it has higher priority on the CAN alternate functions and on segment address functions. 2. If SALSEL= 10 and I2C is enabled, P4.5 and P4.6 continue to output address lines. P4.0 P4.1 P4.2 P4.3 P4.4 P4.5 P4.6 P4.7 GPIO GPIO GPIO GPIO GPIO/CAN2_RxD/SCL GPIO/CAN1_RxD GPIO/CAN1_TxD GPIO/CAN2_TxD/SDA Segment address A16 Segment address A17 GPIO GPIO GPIO/CAN2_RxD/SCL GPIO/CAN1_RxD GPIO/CAN1_TxD GPIO/CAN2_TxD/SDA Segment. address A16 Segment address A17 Segment address A18 Segment address A19 GPIO/CAN2_RxD/SCL GPIO/CAN1_RxD GPIO/CAN1_TxD GPIO/CAN2_TxD/SDA Segment address A16 Segment address A17 Segment address A18 Segment address A19 Segment address A20 Segment address A21 Segment address A22 Segment address A23 Obsolete Product(s) - Obsolete Product(s) |
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