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ST162552 Fiches technique(PDF) 4 Page - Exar Corporation |
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ST162552 Fiches technique(HTML) 4 Page - Exar Corporation |
4 / 28 page 3-138 ST16C2552 Symbol Pin Signal Type Pin Description SYMBOL DESCRIPTION INT A/B 34,17 O Interrupt output A/B. (active high) This pin goes high (when enabled by the interrupt enable register) whenever a re- ceiver error, receiver data available, transmitter empty, or modem status condition flag is detected. MF* A/B 35,19 O OP2* (interrupt enable), BAUDOUT* and RXRDY* outputs. These outputs are multiplexed via Alternate Function Reg- ister. When output enable function is selected the MF* pin stays high when INT out pin is set to three state mode and goes low when INT pin is enabled. See bit-3 modem control register (MCR bit-3). When BAUDOUT function is selected, the 16 X TX/RX Baud rate clock output is generated. RXRDY function can be selected to use to request a DMA transfer of data from the Receive data FIFO. OP2* is the default signal and it is selected immediately after master reset or power-up. TXRDY* A/B 1,32 O Transmit ready. (active low) This pin goes high when the transmit FIFO of the ST16C2552 is full. It can be used as a single or multi-transfer. RTS* A/B 36,23 O Request to send A/B (active low). To indicate that the transmitter has data ready to send. Writing a “1” in the modem control register (MCR bit-1 ) will set this pin to a low state. After the reset this pin will be set to high. Note that this pin does not have any effect on the transmit or receive operation. DTR* A/B 37,27 O Data terminal ready A/B (active low). To indicate that ST16C2552 is ready to receive data. This pin can be controlled via the modem control register (MCR bit-0). Writing a “1” at the MCR bit-0 will set the DTR* output to low. This pin will be set to high state after writing a “0” to that register or after the reset . Note that this pin does not have any effect on the transmit or receive operation. RESET 21 I Master reset. (active high) A high on this pin will reset all the outputs and internal registers. The transmitter output and the receiver input will be disabled during reset time. |
Numéro de pièce similaire - ST162552 |
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Description similaire - ST162552 |
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