參數(shù)資料
型號: SC16C554B
廠商: NXP Semiconductors N.V.
英文描述: 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
中文描述: 5伏,3.3伏和2.5伏兆5四異步/秒(最大),16字節(jié)的FIFO
文件頁數(shù): 14/51頁
文件大小: 253K
代理商: SC16C554B
9397 750 13133
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 9 February 2005
14 of 51
Philips Semiconductors
SC16C554B/554DB
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
6.1 Interface options
Two user interface modes are selectable for the PLCC68 package. These interface modes
are designated as the ‘16 mode’ and the ‘68 mode’. This nomenclature corresponds to the
early 16C454/554 and 68C454/554 package interfaces respectively.
6.1.1
The 16 mode interface
The 16 mode configures the package interface pins for connection as a standard
16 series (Intel) device and operates similar to the standard CPU interface available on
the 16C454/554. In the 16 mode (pin 16/68 = logic 1), each UART is selected with
individual chip select (CSx) pins, as shown in
Table 3
.
6.1.2
The 68 mode interface
The 68 mode configures the package interface pins for connection with Motorola, and
other popular microprocessor bus types. The interface operates similar to the
68C454/554. In this mode, the SC16C554B/554DB decodes two additional addresses,
A3 to A4, to select one of the four UART ports. The A3 to A4 address decode function is
used only when in the 68 mode (16/68 = logic 0), and is shown in
Table 4
.
Table 3:
CSA
1
0
1
1
1
Serial port channel selection, 16 mode interface
CSB
CSC
1
1
1
1
0
1
1
0
1
1
CSD
1
1
1
1
0
UART channel
none
A
B
C
D
Table 4:
CS
1
0
0
0
0
Serial port channel selection, 68 mode interface
A4
A3
n/a
n/a
0
0
0
1
1
0
1
1
UART channel
none
A
B
C
D
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