Freescale Semiconductor MCF5480 - Manual (Page 774)

MCF548x Reference Manual, Rev. 3
26-12 Freescale Semiconductor
Table 26-7. PSCCRn Field Descriptions
Bits Value Command Description
7 — Reserved, should be cleared.
6–4 MISC Field (This field selects a single command.)
000 N O C OMMAND —
001 R ESET M ODE
R EGISTER
P OINTER
Causes the mode register pointer to point to PSCMR1n.
010 R ESET
R ECEIVER
The receiver and RxFIFO are immediately reset. The receiver is disabled. The FU and RxRDY
bits in the PSCSR are cleared and RxFIFO is initialized. All other registers are unaltered.
011 R ESET
T RANSMITTER
The transmitter and TxFIFO immediately reset. The transmitter is disabled.
• In UART and SIR mode, the TxEMP and TxRDY bits in PSCSR are cleared.
• In modem, MIR and FIR mode, the URERR bit is not cleared and the TxRDY is asserted due
to no holding data in TxFIFO.
100 R ESET E RROR
S TATUS
• In UART and SIR mode, the RB, FE_CDE (FE in SIR mode), PE and OE bits in PSCSR are
cleared.
• In modem mode, the OE and URERR are cleared.
• In MIR and FIR mode, the PHYERR, CRCERR, OE and URERR are cleared.
101 R ESET
B REAK –
C HANGE
I NTERRUPT
The delta break bit, DB, in PSCISR is cleared. This command has no effect in modem, MIR and
FIR mode.
110 S TART B REAK This command forces PSCnTXD port low. If the transmitter is empty, the start of the break
conditions can be delayed up to one bit time. If the transmitter is active, the break begins when
the transmission of the character is completed. If a character is in the transmitter shift register, the
start of the break delayed until the character is transmitted. If the TxFIFO has a character, the
character is transmitted after the break. The transmitter must be enabled for this command to be
accepted. The state of the PSCnCTS input port is ignored for this command.
This command has no effect in modem, MIR, and FIR mode.
111 S TOP B REAK This command causes PSCnTXD to go high (mark) with two bit times. If there are any characters
stored in the TxFIFO, they are transmitted. This command has no effect in modem, MIR, and FIR
mode.