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ST16C550 データシート(PDF) 4 Page - Exar Corporation |
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ST16C550 データシート(HTML) 4 Page - Exar Corporation |
4 / 35 page ST16C550 4 Rev. 5.01 Symbol Pin Signal Pin Description 40 44 48 type SYMBOL DESCRIPTION A0 28 31 28 I Address-0 Select Bit Internal registers address selection. A1 27 30 27 I Address-1 Select Bit Internal registers address selection. A2 26 29 26 I Address-2 Select Bit Internal registers address selection. IOR 22 25 20 I Read data strobe. Its function is the same as -IOR (see - IOR), except it is active high. Either an active -IOR or IOR is required to transfer data from 16C550 to CPU during a read operation. Connect to logic 0 when using -IOR. CS0 12 14 9 I Chip Select-0. Logical 1 on this pin provides the chip select- 0 function. Connect CS0 to logic 1 if using CS1 or -CS2. CS1 13 15 10 I Chip Select-1. Logical 1 on this pin provides the chip select- 1 function. Connect CS1 to logic 1 if using CS0 or -CS2. -CS2 14 16 11 I Chip Select -2. Logical 0 on this pin provides the chip select- 2 function. Connect to logic 0 if using CS0 or CS1. IOW 19 21 17 I Write data strobe. Its function is the same as -IOW (see - IOW), but it acts as an active high input signal. Either -IOW or IOW is required to transfer data from the CPU to ST16C550 during a write operation. Connect to logic 0 when using -IOW. -AS 25 28 24 I Address Strobe. A logic 1 transition on -AS latches the state of the chip selects and the register select bits, A0-A2. This input is used when address and chip selects are not stable for the duration of a read or write operation, i.e., a micropro- cessor that needs to de-multiplex the address and data bits. If not required, the -AS input can be permanently tied to a logic 0. D0-D7 1-8 2-9 43-47 2-4 I/O Data Bus (Bi-directional) - These pins are the eight bit, tri- state data bus for transferring information to or from the controlling CPU. D0 is the least significant bit and the first data bit in a transmit or receive serial data stream. GND 20 22 18 Pwr Signal and Power Ground. |
同様の部品番号 - ST16C550 |
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同様の説明 - ST16C550 |
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