SC16C554DB datasheet(14/51 Pages) PHILIPS

14 / 51 page

9397 750 13133

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:

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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