MPC8280 datasheet(770/1386 Pages) FREESCALE

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SCC BISYNC Mode

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

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.

Field

—

DCC

—

GRA

—

TXE

RCH

BSY

TXB

RXB

Reset

0000_0000_0000_0000

R/W

Addr

0x11A10 (SCCE1); 0x11A30 (SCCE2); 0x11A50 (SCCE3); 0x11A70 (SCCE4)

0x11A14 (SCCM1); 0x11A34 (SCCM2); 0x11A54 (SCCM3); 0x11A74 (SCCM4)

Figure 23-8. BISYNC Event Register (SCCE)/BISYNC Mask Register (SCCM)

Table 23-13. SCCE/SCCM Field Descriptions1

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.

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.

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.

TXE

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

TxBD[I] bit.

RCH

Receive character. Set when a character is received and written to the buffer.

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.

TXB

Tx buffer. Set when a buffer is sent. TXB is set as the last bit of data or the BCS begins transmission.

RXB

Rx buffer. Set when the CPM closes the receive buffer on the BISYNC channel.

567

Field

—

Reset

0000_0000

R/W

Addr

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

Figure 23-9. SCC Status Registers (SCCS)

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