Motorola PowerQUICC II MPC8280 Series Reference Manual page 997

Table 30-2. GFMR Register Field Descriptions (continued)
Bits Name
27 ENT Enable transmit. Enables the transmitter hardware state machine for this FCC.
0 The transmitter is disabled. If ENT is cleared during transmission, the transmitter aborts the
current character and TXD returns to idle state. Data in the transmit shift register is not sent.
1 The transmitter is enabled.
ENT can be set or cleared, regardless of whether serial clocks are present. See Section 30.12,
"Disabling the FCCs On-the-Fly," for a description of the proper methods to disable and reenable an
FCC. Note that the FCC provides other tools for controlling transmission besides the ENT bit—the
STOP TRANSMIT
TxBD[R].
28–31 MODE Channel protocol mode
0000 HDLC
0001 Reserved for RAM microcode
0010 Reserved
0011 Reserved for RAM microcode
0100 Reserved
0101 Reserved for RAM microcode
0110 Reserved
0111 Reserved for RAM microcode
1000 Reserved
1001 Reserved for RAM microcode
1010 ATM
1011 Reserved for RAM microcode
1100 Ethernet
11xx Reserved
In addition to selecting the correct mode of operation in
GFMRx[MODE], the user must issue the appropriate CP
command and choose the correct protocol in CPCR (refer to
Section 14.4.1, "CP Command Register (CPCR)").
30.2.1 General FCC Expansion Mode Register (GFEMR)
The general FCC expansion mode register (GFEMR) defines the expansion modes. It
should be programmed according to the protocol used.
0
Field TIREM
Reset
R/W
Addr
Figure 30-3. General FCC Expansion Mode Register (GFEMR)
MOTOROLA Chapter 30. Fast Communications Controllers (FCCs)
Freescale Semiconductor, Inc.
,
GRACEFUL STOP TRANSMIT
NOTE
1 2
LPB CLK
0x11390 (GFEMR1), 0x113B0(GFEMR2), 0x113D0(GFEMR3)
For More Information On This Product,
Go to: www.freescale.com
General FCC Mode Registers (GFMRx)
Description
, and commands, CTS flow control, and
RESTART TRANSMIT
3
—
0000_0000
R/W
7
30-7