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Bit 0
Pulse Modulation
Pulse modulation for the current-saving link between SPC4-1 or SPC4-2 and the ASIC SIM1 can be
activated here.
0 =
Pulse modulation is deactivated (reset value)
1 =
Pulse modulation is enabled
Bit 1
Debug
The SPC4-1 or SPC4-2 triggers an interrupt (write violation) as soon as a previously specified micro
sequencer command is executed.
0 =
Debug interrupt disabled (reset value)
1 =
Debug interrupt enabled
Bit 2
Quick-Sync-New
Activates the improved fast synchronizer in the Manchester receiver
0 =
Improvement is inactive (reset value)
1 =
Improvement active
Bit 3
Segment16
Activates the 16 byte segments for addressing of the 3K RAM of the SPC4-2
0 =
8 byte segments (reset value)
1 =
16-byte segments; in other words, complete addressing of the 3K RAM is possible.
Bit 5..4
XHOLDTOKEN Mode
Function of the output pin XHOLDTOKEN
00
After reset; XHOLDTOKEN function as for SPC4/SPC4-1 (see mode register 2)
=
01
Error trigger signal on receive error, pulse
=
10
Error trigger signal on send error compare with level at TXD_TXS, pulse
=
11
Error trigger signal on send error compare with level at RXD_RXS, pulse
=
Bit 6
RXD_RXS level
RXD_RXS level for XHOLDTOKEN mode "11"
0 =
No inversion compared with TXD_TXS (reset value)
1 =
The send signal is inverted on the way from TXD_TXS to RXD_RXS.
Bit 7
FF Mode
Activates the FF mode (see Section 7.7)
0 =
No FF mode (reset value)
1=
FF mode active
Table 7-15 : Mode Register 3
PROFIBUS Controller SPC 4®-2 LF
C79000-G8976-C157-3
ASIC Interface
77
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