MC68340 datasheet(323/441 Pages) FREESCALE

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7- 28

MC68340 USER’S MANUAL

MOTOROLA

MISC3–MISC0—Miscellaneous Commands

These bits select a single command as listed in Table 7-6.

Table 7-6. MISCx Control Bits

MISC3

MISC2

MISC1

MISC0

Command

No Command

Reset Receiver

Reset Transmitter

Reset Error Status

Reset Break-Change

Interrupt

Start Break

Stop Break

Assert

RTS

Negate

RTS

No Command

Reset Receiver—The reset receiver command resets the channel receiver. The receiver

is immediately disabled, the FFULL and RxRDY bits in the SR are cleared, and the

receiver FIFO pointer is reinitialized. All other registers are unaltered. This command

should be used in lieu of the receiver disable command whenever the receiver

configuration is changed because it places the receiver in a known state.

Reset Transmitter—The reset transmitter command resets the channel transmitter. The

transmitter is immediately disabled, and the TxEMP and TxRDY bits in the SR are

cleared. All other registers are unaltered. This command should be used in lieu of the

transmitter disable command whenever the transmitter configuration is changed

because it places the transmitter in a known state.

Reset Error Status—The reset error status command clears the channel's RB, FE, PE,

and OE bits (in the SR). This command is also used in the block mode to clear all error

bits after a data block is received.

Reset Break-Change Interrupt—The reset break-change interrupt command clears the

delta break (DBx) bits in the ISR.

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