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ST16C580CJ44 Datasheet(PDF) 4 Page - Exar Corporation |
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ST16C580CJ44 Datasheet(HTML) 4 Page - Exar Corporation |
4 / 41 page ST16C580 4 Rev. 1.20 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 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 580 to CPU during a read operation. CS0 12 14 9 I Chip Select-0. A logical 1 on this pin provides the chip select 0 function. CS1 13 15 10 I Chip Select-1. A logical 1 on this pin provides the chip select 1 function. -CS2 14 16 11 I Chip Select -2. A logical 0 on this pin provides the chip select 2 function. IOW 19 21 17 I Write strobe. A logic 1 transition creates a write 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 580 during a write operation. -AS 25 28 24 I Address Strobe. A logic 0 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 (it is edge triggered). D0-D7 1-8 2-9 43-47 2-4 I/O Data Bus (Bi-directional) - These pins are the eight bit, three 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. Symbol Pin Signal Pin Description 40 44 48 type |
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