Freescale Semiconductor MPC8260 - Manual (Page 766)

SCC BISYNC Mode
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
23-16 Freescale Semiconductor
Table 23-13 describes SCCE and SCCM fields.
23.15 SCC Status Registers (SCCS)
The SCC status (SCCS) register, seen in Figure 23-9 , allows real-time monitoring of RXD. The real-time
status of CTS and CD are part of the parallel I/O.
Table 23-14 describes SCCS fields.
0 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Field — DCC — GRA — TXE RCH BSY TXB RXB
Reset 0000_0000_0000_0000
R/W R/W
Addr 0x0x11A10 (SCCE1); 0x0x11A30 (SCCE2); 0x0x11A50 (SCCE3); 0x0x11A70 (SCCE4)
0x0x11A14 (SCCM1); 0x0x11A34 (SCCM2); 0x0x11A54 (SCCM3); 0x0x11A74 (SCCM4)
Figure 23-8. BISYNC Event Register (SCCE)/BISYNC Mask Register (SCCM)
Table 23-13. SCCE/SCCM Field Descriptions
1
1
Reserved bits in the SCCE should not be masked in the SCCM register.
Bits Name Description
0–4 — Reserved, should be cleared. Refer to note 1 below.
5 DCC DPLL CS changed. Set when carrier sense status generated by the DPLL changes. Real-time
status can be found in SCCS. This is not the CD status discussed elsewhere. Valid only when DPLL
is used.
6–7 — Reserved, should be cleared. Refer to note 1 below.
8 GRA Graceful stop complete. Set as soon the transmitter finishes any message in progress when a
GRACEFUL STOP TRANSMIT is issued (immediately if no message is in progress).
9–10 — Reserved, should be cleared. Refer to note 1 below.
11 TXE Tx Error. Set when an error occurs on the transmitter channel.
12 RCH Receive character. Set when a character is received and written to the buffer.
13 BSY Busy. Set when a character is received and discarded due to a lack of buffers. The receiver resumes
reception after an
ENTER HUNT MODE command.
14 TXB Tx buffer. Set when a buffer is sent. TXB is set as the last bit of data or the BCS begins transmission.
15 RXB Rx buffer. Set when the CPM closes the receive buffer on the BISYNC channel.
0 5 6 7
Field — CS —
Reset 0000_0000
R/W R
Addr 0x0x11A17 (SCCS1); 0x0x11A37 (SCCS2); 0x0x11A57 (SCCS3); 0x0x11A77 (SCCS4)
Figure 23-9. SCC Status Registers (SCCS)