MPC8280 datasheet(786/1386 Pages) FREESCALE

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SCC Transparent Mode

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

24-12

Freescale Semiconductor

24.13 SCC Status Register in Transparent Mode (SCCS)

The SCC status register (SCCS) allows monitoring of real-time status conditions on the RXD line. The

real-time status of CTS and CD are part of the parallel I/O.

Table 24-10 describes SCCS fields.

GRA

Graceful stop complete. Set when a graceful stop initiated by completes as soon as the transmitter

finishes any frame in progress when the GRACEFUL STOP TRANSMIT command was issued.

Immediately if no frame was in progress when the command was issued.

9–10

—

Reserved, should be cleared. Refer to note 1 below.

TXE

Tx error. Set when an error occurs on the transmitter channel. This event is not maskable via the

TxBD[I] bit.

—

Reserved, should be cleared. Refer to note 1 below.

BSY

Busy condition. Set when a byte or word is received and discarded due to a lack of buffers. The

receiver resumes reception after it gets an ENTER HUNT MODE command.

TXB

Tx buffer. Set no sooner than when the last bit of the last byte of the buffer begins transmission,

assuming L is set in the TxBD. If it is not, TXB is set when the last byte is written to the transmit FIFO.

RXB

Rx buffer. Set when a complete buffer was received on the SCC channel, no sooner than two serial

clocks after the last bit of the last byte in which the buffer is received on RXD.

1 Reserved bits in the SCCE should not be masked in the SCCM register.

01234567

Field

—

Reset

0000_0000

R/W

Addr

0x11A17 (SCCS1); 0x11A37 (SCCS2); 0x11A57 (SCCS3); 0x11A77 (SCCS4)

Figure 24-5. SCC Status Register in Transparent Mode (SCCS)

Table 24-10. SCCS Field Descriptions

Bit

Name

Description

0–5

—

Reserved, should be cleared.

Carrier sense (DPLL). Shows the real-time carrier sense of the line as determined by the DPLL.

0 The DPLL does not sense a carrier.

1 The DPLL senses a carrier.

—

Reserved, should be cleared.

Table 24-9. SCCE/SCCM Field Descriptions (continued)1

Bit

Name

Description

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