sc16c654 NXP Semiconductors, sc16c654 Datasheet - Page 12

• Manufacturer Part Number: sc16c654
• Description: Quad Uart With 64-byte Fifo And Infrared Irda Encoder/decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 11617
Product data
6.1 Interface options
6.2 The 16 mode interface
6.3 The 68 mode interface
character. In the 16 mode, INTSEL and MCR[3] can be configured to provide a
software controlled or continuous interrupt capability. Due to pin limitations of the
64-pin package, this feature is offered by two different LQFP64 packages. The
SC16C654D operates in the continuous interrupt enable mode by bonding INTSEL to
V
INTSEL to GND internally.
The PLCC68 SC16C654 package offers a clock select pin to allow system/board
designers to preset the default baud rate table. The CLKSEL pin selects the 1 or 4
pre-scalable baud rate generator table during initialization, but can be overridden
following initialization by MCR[7].
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.
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:
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 SC16C654/654D decodes two additional addresses,
A3-A4, to select one of the four UART ports. The A3-A4 address decode function is
used only when in the 68 mode (16/68 = logic 0), and is shown in
Table 4:
CSA
1
0
1
1
1
CS
1
0
0
0
0
CC
internally. The SC16C654 operates in conjunction with MCR[3] by bonding
Serial port channel selection, 16 mode interface
Serial port channel selection, 68 mode interface
CSB
1
1
0
1
1
Quad UART with 64-byte FIFO and infrared (IrDA) encoder/decoder
A4
n/a
0
0
1
1
Rev. 04 — 19 June 2003
CSC
1
1
1
0
1
A3
n/a
0
1
0
1
CSD
1
1
1
1
0
UART channel
none
A
B
C
D
UART channel
none
A
B
C
D
Table
SC16C654/654D
3.
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Table
4.
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