MC68340 datasheet(321/441 Pages) FREESCALE

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7- 26

MC68340 USER’S MANUAL

MOTOROLA

7.4.1.6 CLOCK-SELECT REGISTER (CSR). The CSR selects the baud rate clock for the

channel receiver and transmitter. This register can only be written when the serial module

is enabled (i.e., the STP bit in the MCR is cleared).

NOTE

This register should only be written after the external crystal is

stable (XTAL_RDY bit of the ISR is zero).

CSRA, CSRB

$711, $719

76543210

RCS3

RCS2

RCS1

RCS0

TCS3

TCS2

TCS1

TCS0

RESET:

00000000

Write Only

Supervisor/User

RCS3–RCS0—Receiver Clock Select

These bits select the baud rate clock for the channel receiver from a set of baud rates

listed in Table 7-4. The baud rate set selected depends upon the auxiliary control

7 = 1. The receiver clock is always 16 times the baud rate shown in this list, except

when SCLK is used.

Table 7-4. RCSx Control Bits

RCS3

RCS2

RCS1

RCS0

Set 1

Set 2

110

134.5

200

150

300

600

1200

1050

2000

2400

4800

7200

1800

9600

38.4k

19.2k

76.8k

38.4k

SCLK/16

SCLK/1

Freescale Semiconductor, Inc.

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