MC68340 datasheet(313/441 Pages) FREESCALE

313 / 441 page

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MC68340 USER’S MANUAL

MOTOROLA

NOTE

All serial module registers are only accessible as bytes. The

contents of the mode registers (MR1 and MR2), clock-select

should only be changed after the receiver/transmitter is issued

a software RESET command—i.e., channel operation must be

disabled. Care should also be taken if the register contents are

changed during receiver/transmitter operations, as undesirable

results may be produced.

In the registers discussed in the following pages, the numbers in the upper right-hand

corner indicate the offset of the register from the base address specified in the module

base address register (MBAR) in the SIM40. The numbers above the register description

represent the bit position in the register. The register description contains the mnemonic

for the bit. The values shown below the register description are the values of those

by reset. The read/write status and the access privilege are shown in the last line.

NOTE

A CPU32 RESET instruction will not affect the MCR, but will

reset all the other serial module registers as though a

hardware reset had occurred. The module is enabled when the

STP bit in the MCR is cleared. The module is disabled when

the STP bit in the MCR is set.

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MC68340 Datasheet(PDF) 313 Page - Freescale Semiconductor, Inc