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ST10F269 数据表(PDF) 10 Page - STMicroelectronics |
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ST10F269 数据表(HTML) 10 Page - STMicroelectronics |
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10 / 160 page  ST10F269 10/160 P4.0 –P4.7 85-92 I/O Port 4 is an 8-bit bidirectional I/O port. It is bit-wise programmable for input or output via direction bit. Programming an I/O pin as input forces the corresponding output driver to high impedance state. The input threshold is selectable (TTL or special). Port 4.6 & 4.7 outputs can be configured as push-pull or open drain drivers. In case of an external bus configuration, Port 4 can be used to output the segment address lines: 85 O P4.0 A16 Segment Address Line 86 O P4.1 A17 Segment Address Line 87 O P4.2 A18 Segment Address Line 88 O P4.3 A19 Segment Address Line 89 O P4.4 A20 Segment Address Line I CAN2_RxD CAN2 Receive Data Input 90 O P4.5 A21 Segment Address Line I CAN1_RxD CAN1 Receive Data Input 91 O P4.6 A22 Segment Address Line O CAN1_TxD CAN1 Transmit Data Output 92 O P4.7 A23 Most Significant Segment Address Line O CAN2_TxD CAN2 Transmit Data Output RD 95 O External Memory Read Strobe. RD is activated for every external instruction or data read access. WR/WRL 96 O External Memory Write Strobe. In WR-mode this pin is activated for every external data write access. In WRL mode this pin is activated for low Byte data write accesses on a 16-bit bus, and for every data write access on an 8-bit bus. See WRCFG in the SYSCON register for mode selection. READY/ READY 97 I Ready Input. The active level is programmable. When the Ready function is enabled, the selected inactive level at this pin, during an external memory access, will force the insertion of waitstate cycles until the pin returns to the selected active level. ALE 98 O Address Latch Enable Output. In case of use of external addressing or of multi- plexed mode, this signal is the latch command of the address lines. EA 99 I External Access Enable pin. A low level applied to this pin during and after Reset forces the ST10F269 to start the program from the external memory space. A high level forces the MCU to start in the internal memory space. Symbol Pin Type Function |
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