ST16C580 查看數據表（PDF） - Exar Corporation
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ST16C580 Datasheet PDF : 41 Pages
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ST16C580
SYMBOL DESCRIPTION
Symbol
-IOR
-IOW
INT
-RXRDY
-TXRDY
-BAUDOUT
-DDIS
-OP1
-OP2
RCLK
Pin
Signal
40 44 48 type
Pin Description
21 24 19
I Read strobe (active low strobe). A logic 0 on this pin transfers
the contents of the 580 data bus to the CPU.
18 20 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.
30 33 30
O Interrupt Request.
29
32
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.
24
27
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.
15
17
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.
23
26
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.
34
38
34
O Output-1 (User Defined) - See bit-2 of modem control
register (MCR bit-2).
31
35
31
O Output-2 (User Defined). This pin provides the user a
general purpose output. See bit-3 modem control register
(MCR bit-3).
9
10
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.
Rev. 1.20
5
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