SC16C554BIB64 PHILIPS [NXP Semiconductors], SC16C554BIB64 Datasheet - Page 11

• Manufacturer Part Number: SC16C554BIB64
• Description: 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Table 2:
9397 750 13133
Product data sheet
Symbol
IOW
IRQ
n.c.
RESET
(RESET)
RIA, RIB,
RIC, RID
RTSA, RTSB,
RTSC, RTSD
R/W
Pin description
Pin
PLCC68 LQFP64 LQFP80
18
15
21, 49,
52, 54,
55, 65
37
8, 28,
42, 62
14, 22,
48, 56
18
9
-
-
27
63, 19,
30, 50
5, 13,
36, 44
-
…continued
31
-
1, 10,
20, 21,
30, 40,
41, 49,
52, 60,
61, 71,
80
53
18, 43,
58, 3
26, 35,
66, 75
-
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
Type
I
O
-
I
I
O
I
Rev. 01 — 9 February 2005
Description
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 to D7) from the external
CPU to an internal register that is defined by address bits A0 to A2.
When the 68 mode is selected, this pin functions as R/W (see
definition under R/W).
Interrupt Request or Interrupt ‘A’. This function is associated with
the 68 mode only. In the 68 mode, interrupts from UART channels
A to 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 register) whenever a UART channel(s) requires service.
Individual channel interrupt status can be determined by addressing
each channel through its associated internal register, using CS and
A3 to A4. In the 68 mode, and external pull-up resistor must be
connected between this pin and V
changes to INTA when operating in the 16 mode (see definition
under INTA).
not connected
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
“SC16C554B/554DB external reset conditions”
details.) When 16/68 is a logic 0 (68 mode), this pin functions
similarly, bus as an inverted reset interface signal, RESET.
Ring Indicator (active LOW). These inputs are associated with
individual UART channels, A to 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.
Request to Send (active LOW). These outputs are associated with
individual UART channels, A to 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 MCR[5] for hardware flow
control operation.
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 to A4.
Logic 0 = Write to UART register selected by CS and A0 to A4.
SC16C554B/554DB
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
CC
. The function of this pin
for initialization
Section 7.10
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