SC16C554 datasheet(11/55 Pages) PHILIPS

11 / 55 page

Philips Semiconductors

SC16C554/554D

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

Product data

Rev. 05 — 10 May 2004

11 of 55

9397 750 13132

IOW

Input/Output Write strobe (Active-LOW). This function is

associated with the 16 mode only. A logic 0 transition on this pin will

transfer the contents of the data bus (D0-D7) from the external CPU

to an internal register that is deﬁned by address bits A0-A2. When

the 68 mode is selected, this pin functions as R/W (see deﬁnition

under R/W).

IRQ

Interrupt Request or Interrupt ‘A’. This function is associated with

the 68 mode only. In the 68 mode, interrupts from UART channels

A-D are wire-ORed internally to function as a single IRQ interrupt.

This pin transitions to a logic 0 (if enabled by the interrupt enable

channel interrupt status can be determined by addressing each

channel through its associated internal register, using CS and A3-A4.

In the 68 mode, and external pull-up resistor must be connected

between this pin and VCC. The function of this pin changes to INTA

when operating in the 16 mode (see deﬁnition under INTA).

n.c.

21, 49,

52, 54,

55, 65

1, 10,

20, 21,

30, 40,

41, 49,

52, 60,

61, 71,

Not connected.

RESET

(RESET)

Reset. In the 16 mode, a logic 1 on this pin will reset the internal

registers and all the outputs. The UART transmitter output and the

receiver input will be disabled during reset time. (See Section 7.11

“SC16C554/554D external reset conditions” for initialization details.)

When 16/68 is a logic 0 (68 mode), this pin functions similarly, but as

an inverted reset interface signal, RESET.

RIA, RIB,

RIC, RID

8, 28,

42, 62

63, 19,

30, 50

18, 43,

58, 3

Ring Indicator (Active-LOW). These inputs are associated with

individual UART channels, A through D. A logic 0 on this pin indicates

the modem has received a ringing signal from the telephone line. A

logic 1 transition on this input pin will generate an interrupt.

RTSA, RTSB,

RTSC, RTSD

14, 22,

48, 56

5, 13,

36, 44

26, 35,

66, 75

Request to Send (Active-LOW). These outputs are associated with

individual UART channels, A through D. A logic 0 on the RTS pin

indicates the transmitter has data ready and waiting to send. Writing

a logic 1 in the modem control register MCR[1] will set this pin to a

logic 0, indicating data is available. After a reset this pin will be set to

a logic 1. This pin only affects the transmit and receive operations

when Auto RTS function is enabled via the Enhanced Feature

R/W18

Read/Write strobe. This function is associated with the 68 mode

only. This pin provides the combined functions for Read or Write

strobes.

Logic 1 = Read from UART register selected by CS and A0-A4.

Logic 0 = Write to UART register selected by CS and A0-A4.

Table 2:

Pin description…continued

Symbol

Type

Description

PLCC68 LQFP64 LQFP80

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