Clock-Select Register (Csr) - Motorola MC68340 User Manual

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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).

This register should only be written after the external crystal is

stable (XTAL_RDY bit of the ISR is zero).

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.

Freescale Semiconductor, Inc.

Table 7-4. RCSx Control Bits

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