Scc Status Register In Transparent Mode (Sccs) - Freescale Semiconductor MPC850 User Manual

SCC Status Register in Transparent Mode (SCCS)

Bit 0 1
Field —
Reset
R/W
Address
Figure 28-4. SCC Transparent Event Register (SCCE)/Mask Register (SCCM)
Table 28-9 describes SCCE/SCCM fields.
Bit Name
0–2 — Reserved, should be cleared.
3 GLR Glitch on Rx. Set when the SCC finds a glitch on the receive clock.
4 GLT Glitch on Tx. Set when the SCC finds a glitch on the transmit clock.
5 DCC DPLL CS changed. Set when the DPLL-generated carrier sense status changes (valid only when the
DPLL is used). Real-time status can be read in SCCS. This is not the CD status mentioned
elsewhere.
6–7 — Reserved, should be cleared.
8 GRA Graceful stop complete. Set when a graceful stop initiated by completes as soon as the transmitter
finishes any frame in progress when the
Immediately if no frame was in progress when the command was issued.
9–1 — Reserved, should be cleared.
0
11 TXE Tx error. Set when an error occurs on the transmitter channel.
12 — Reserved, should be cleared.
13 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
14 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.
15 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.
28.13 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 port C parallel I/O.
2 3 4 5
GLR GLT DCC
0000_0000_0000_0000
0xA30 (SCCE2)/0xA34 (SCCM2); 0xA50 (SCCE3)/0xA54 (SCCM3)
Table 28-9. SCCE/SCCM Field Descriptions
MPC850 Family User's Manual
6 7 8 9 10
— GRA —
R/W
Description
GRACEFUL STOP TRANSMIT
command.
ENTER HUNT MODE
11 12 13 14
TXE — BSY TXB RXB
command was issued.
15