SC16C752B datasheet(6/47 Pages) PHILIPS

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Philips Semiconductors

SC16C752B

5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs

Product data

Rev. 03 — 14 December 2004

6 of 47

9397 750 14443

OPA, OPB

32, 9

22, 7

User deﬁned outputs. This function is associated with individual channels A

and B. The state of these pins is deﬁned by the user through the software

settings of MCR[3]. INTA-INTB are set to active mode and OPA-OPB to a

logic 0 when MCR[3] is set to a logic 1. INTA-INTB are set to the 3-State

mode and OPA-OPB to a logic 1 when MCR[3] is set to a logic 0. The output

of these two pins is HIGH after reset.

RESET

Reset. 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.

RESET is an active-HIGH input.

RIA, RIB

41, 21

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

UART channels, A and B. A logic 0 on these pins indicates the modem has

received a ringing signal from the telephone line. A LOW-to-HIGH transition

on these input pins generates a modem status interrupt, if enabled. The state

of these inputs is reﬂected in the modem status register (MSR).

RTSA,

RTSB

33, 22

23, 15

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

individual UART channels, A and B. 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 these pins are set to a logic 1. These pins only affect

the transmit and receive operations when Auto-RTS function is enabled via

the Enhanced Feature Register (EFR[6]) for hardware ﬂow control operation.

RXA, RXB

5, 4

4, 3

Receive data input. These inputs are associated with individual serial

channel data to the SC16C752B. During the local loop-back mode, these RX

input pins are disabled and TX data is connected to the UART RX input

internally.

RXRDYA,

RXRDYB

31, 18

Receive Ready (Active-LOW). RXRDYA or RXRDYB goes LOW when the

trigger level has been reached or the FIFO has at least one character. It goes

HIGH when the RX FIFO is empty.

TXA, TXB

7, 8

5, 6

Transmit data A, B. These outputs are associated with individual serial

transmit channel data from the SC16C752B. During the local loop-back

mode, the TX output pin is disabled and TX data is internally connected to

the UART RX input.

TXRDYA,

TXRDYB

43, 6

Transmit Ready (Active-LOW). TXRDYA or TXRDYB go LOW when there

are at least a trigger level number of spaces available or when the FIFO is

empty. It goes HIGH when the FIFO is full or not empty.

VCC

Power supply input.

XTAL1

Crystal or external clock input. Functions as a crystal input or as an

external clock input. A crystal can be connected between XTAL1 and XTAL2

to form an internal oscillator circuit (see Figure 13). Alternatively, an external

clock can be connected to this pin to provide custom data rates.

XTAL2

Output of the crystal oscillator or buffered clock. (See also XTAL1.)

XTAL2 is used as a crystal oscillator output or a buffered clock output.

Table 2:

Pin description…continued

Symbol

Type

Description

LQFP48 HVQFN32

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