SC16C554 datasheet(14/55 Pages) PHILIPS

14 / 55 page

Philips Semiconductors

SC16C554/554D

Quad UART with 16-byte FIFO and infrared (IrDA) encoder/decoder

Product data

Rev. 05 — 10 May 2004

14 of 55

9397 750 13132

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.

6.2 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.

6.3 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 SC16C554/554D 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.

Table 3:

Serial port channel selection, 16 mode interface

CSA

CSB

CSC

CSD

UART channel

1111

none

0111A

1011B

1101C

1110D

Table 4:

Serial port channel selection, 68 mode interface

UART channel

n/a

none

000A

001B

010C

011D

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