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ST16C580IQ48 Datasheet(PDF) 4 Page - Exar Corporation |
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ST16C580IQ48 Datasheet(HTML) 4 Page - Exar Corporation |
4 / 39 page ST16C580 4 Rev. 1.22 -IOR 19 I Read strobe (active low strobe). A logic 0 on this pin transfers the contents of the 580 data bus to the CPU. -IOW 16 I Write strobe (active low strobe) - A logic 0 on this pin transfers the contents of the CPU data bus to the addressed internal register. INT 30 O Interrupt Request. -RXRDY 29 O Receive Ready. A logic 0 indicates receive data ready status, i.e. the RHR is full or the FIFO has one or more RX characters available for unloading. This pin goes to a logic 0 when the FIFO/RHR is full or when there are more characters available in either the FIFO or RHR. -TXRDY 23 O Transmit Ready. Buffer ready status is indicated by a logic 0, i.e., at least one location is empty and available in the FIFO or THR. This pin goes to a logic 1 when there are no more empty locations in the FIFO or THR. -BAUDOUT 12 O Baud Rate Generator Output. This pin provides the 16X clock of the selected data rate from the baud rate generator. The RCLK pin must be connected externally to -BAUDOUT when the receiver is operating at the same data rate. -DDIS 22 O Drive Disable. This pin goes to a logic 0 when the external CPU is reading data from the 580. This signal can be used to disable external transceivers or other logic functions. -OP1 34 O Output-1 (User Defined) - See bit-2 of modem control register (MCR bit-2). -OP2 31 O Output-2 (User Defined). This pin provides the user a general purpose output. See bit-3 modem control register (MCR bit- 3). RCLK 5 I Receive Clock Input. This pin is used as external 16X clock input to the receiver section. External connection to - Baudout pin is required in order to utilize the internal baud rate generator. SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 48 type |
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