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ST162552 Fiches technique(PDF) 3 Page - Exar Corporation |
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ST162552 Fiches technique(HTML) 3 Page - Exar Corporation |
3 / 28 page 3-137 ST16C2552 Symbol Pin Signal Type Pin Description SYMBOL DESCRIPTION D0-D7 2-9 I/O Bi-directional data bus. Eight bit, three state data bus to transfer information to or from the CPU. D0 is the least significant bit of the data bus and the first serial data bit to be received or transmitted. RX A/B 39,25 I Serial data input A/B. The serial information (data) received from serial port to ST16C2552 receive input circuit. A mark (high) is logic one and a space (low) is logic zero. During the local loopback mode the RX input is disabled from external connection and connected to the TX output internally. TX A/B 38,26 O Serial data output A/B. The serial data is transmitted via this pin with additional start , stop and parity bits. The TX will be held in mark (high) state during reset, local loopback mode or when the transmitter is disabled. CS* 18 I Chip select. (active low) A low at this pin enables the ST16C2552 / CPU data transfer operation. CHSEL 16 I UART A/B select. UART A or B can be selected by changing the state of this pin when CS* is active. Low on this pin, selects the UART B and high on this pin selects UART A section. XTAL1 11 I Crystal input 1 or external clock input. A crystal can be connected to this pin and XTAL2 pin to utilize the internal oscillator circuit. An external clock can be used to clock internal circuit and baud rate generator for custom transmis- sion rates. XTAL2 13 O Crystal input 2 or buffered clock output. See XTAL1. Should be left open if a clcok is connected to XTAL1. IOW* 20 I Write strobe. (active low) A low on this pin will transfer the contents of the CPU data bus to the addressed register. IOR* 24 I Read strobe. (active low) A low level on this pin transfers the contents of the ST16C2552 data bus to the CPU. A0-A2 10,14,15 I Address select lines. To select internal registers. |
Numéro de pièce similaire - ST162552 |
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Description similaire - ST162552 |
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