參數(shù)資料
型號: ST16C580
廠商: Exar Corporation
英文描述: UART WITH 16-BYTE FIFO’s AND INFRARED (IrDA) ENCODER/DECODER
中文描述: UART的16字節(jié)FIFO的和紅外線(IrDA)編碼/解碼器
文件頁數(shù): 4/41頁
文件大小: 244K
代理商: ST16C580
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
44
Signal
type
Pin Description
40
48
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