SC28L202 datasheet(32/77 Pages) PHILIPS

32 / 77 page

Philips Semiconductors

Objective specification

SC28L202

Dual UART

2000 Feb 10

RxCSR – Receiver Clock Select Register A and B

TxCSR Transmitter Clock Select Register A and B

Both registers consist of single 6–bit field that selects the clock source for the receiver and transmitter respectively. During a read the unused

bits in this register read b’000. The “BRG” baud rates (fixed BRG rates) shown in the table below are based on the Sclk crystal frequency of

14.7456 MHz. The baud rates shown below will vary as the Sclk crystal clock varies. For example, if the Sclk rate is changed to 7.3728 MHz all

the rates below will reduce by 1/2.

Bit 7

Bit 6

Bits 5:0

Reserved

Transmitter/Receiver Clock select code,

See Clock Multiplex Table below

Rx and Tx Clock Select Table

NOTE: Sclk maximum rate is 50 MHz. Data clock rates will follow exactly the ratio of the X1/Sclk to 14.7654 MHz

Tx A Clock Select Code

Clock selection, Sclk = 14.7456 MHz

Tx A Clock Select Code

Clock selection, Sclk = 14.7456 MHz

00 0000

BRG – 50

01 0000

BRG – 75

00 0001

BRG – 110

01 0001

BRG – 150

00 0010

BRG – 134.5

01 0010

BRG – 450

00 0011

BRG – 200

01 0011

BRG – 1800

00 0100

BRG – 300

01 0100

BRG – 2000

00 0101

BRG – 600

01 0101

BRG – 14.4K

00 0110

BRG – 1200

01 0110

BRG – 19.2K

00 0111

BRG – 1050

01 0111

BRG – 28.8K

00 1000

BRG – 2400

01 1000

BRG – 57.6K

00 1001

BRG – 4800

01 1001

BRG – 115.2K

00 1010

BRG – 7200

01 1010

BRG – 230.4K

00 1011

BRG – 9600

01 1011

BRG – 460.8K

00 1100

BRG – 38.4K

01 1100

BRG – 921.6K

00 1101

Timer 0

01 1101

Timer 1

00 1110

I/O3 A transmitter – 16x External *

01 1110

PBRG 0

00 1111

I/O3 A transmitter – 1x External *

01 1111

Midi rate 31.25 KHz 1.66% error

Tx A Clock Select Code

Clock selection, Sclk = 14.7456 MHz

Tx A Clock Select Code

Clock selection, Sclk = 14.7456 MHz

11 0000 to 11 1101

Reserved

11 1110

PBRG 1

11 1111

Reserved

This field selects the baud rate clock for the Channel A transmitter.

* External clock Pin and external clock mode assignment.

Tx/Rx CSR x [5:0]

RxC Channel A

TxC Channel B

RxC channel B

001110

I/O4 A 16x

I/O5 A 16x

I/O6 A 16x

001111

I/O4 A 1X

I/O5 A 1X

I/O6 A 1X

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