Siemens SIMATIC NET SPC 4-2 LF Manual page 71

Address
Control 7
register
311 FILTE EARL
H
R_AN Y-
/AUS
READ
Y
Bit 0 DIS-START-CONTROL
Disable start bit monitoring (hamming distance 4, test in UART)
0 = Start bit monitoring is enabled in the receiver (status following reset)
1 = Start bit monitoring is disabled in the receiver
Bit 1 DP-Mode
Set DP mode
0 = No DP functions are supported (status following reset)
1 = The following productive services are supported:
Bit 2 SYN/ASYN
Switchover bit for synchronous or asynchronous mode on the serial interface
0 = Synchronous mode (status following reset)
1 = Asynchronous mode
Bit 3 XRTS/ADD
XRTS/ADD output switchover for different driver activation
0 = RTS (status following reset)
1 = ADD
Bit 4 XPB/PA
Layer 2 setting
0 = PROFIBUS mode (status following reset)
1 = PA Mode
Bit 5 INT-POL
Polarity of the interrupt outputs
0 = The interrupt outputs are low active (status following reset)
1 = The interrupt outputs are high active
Bit 6 EARLY-RDY
Early ready signal
0 = Ready is generated when the data is valid (read) or when the data is accepted (write).(status
following reset)
1 = Ready is brought forward by one clock pulse
Bit 7 FILTER_AN/AUS
Activate receive filter
0 = Filter deactivated (status following reset)
1 = Filter activated
Caution:
If the filter is active during asynchronous transmission, this reduces the maximum baud rate from
qclk-in/4 to qclk-in/16 (example: 48 MHz/4 = 12 Mbauds or 48 MHz/16 =3 Mbauds).
Table 7-12 : Mode Register 0
PROFIBUS Controller SPC 4®-2 LF
C79000-G8976-C157-3
Bit Position
6 5 4
INT- XPB/ XRTS
/
POL PA
ADD
- Data-Exchange
- Read-Input-Data
- Read-Output-Data
- Global-Control frame (Sync, Freeze, Clear-Data)
3 2 1
SYN/ DP DIS-
Mode START-
ASYN
CONTRO
L
ASIC Interface
Meaning
0
Mode-Reg0
7..0
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