sercon410b STMicroelectronics, sercon410b Datasheet - Page 11

• Manufacturer Part Number: sercon410b
• Description: Sercos Interface Controller
• Manufacturer: STMicroelectronics

PIN DESCRIPTION (Continued)
Table 1. SERCON410B I/O Port Function Summary
INT0, INT1
RECACTN
Signal (s)
CYC_CLK
CON_CLK
TM0, TM1
BYTEDIR
SREGEN
DIV_CLK
TxDNRZ
L_ERRN
SBAUD
TxD6-2
SCLK
TxD1
IDLE
RxD
RxC
TxC
14
12
26
16
22,21,2
0,
18,17
24
13
25
30,31
32
34
35
Pin (s)
44,43
100
28
29
36
2
I/O
I/O
IO
O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
Byte address sequence: when BYTEDIR is 0, A0 = 0 addresses the lower
8 bits of a word (low byte first), when BYTEDIR is 1, the upper 8 bits of a
word are addressed (high byte first).
Interrupts, active low or active high. Interrupt sources and signal polarity
are programmable.
Internal regeneration. When SREGEN is 0, clock and data regeneration
are turned off. RxC and TxC are clock inputs. When SREGEN is 1, clock
and data regeneration are turned on. RxC and TxC output the internally
generated clocks.
Baud rate. When regeneration is turned on, SBAUD selects the baud rate
(f
overwritten by the microprocessor.
Receive data for the serial interface.
Receive clock for the serial interface. When regeneration is turned off
(SREGEN = 0), clock input for the serial receiver and transmitter (only
when repeater is turned on); when regeneration is turned on (SREGEN = 1)
output of the internally generated receive clock. The maximum frequency
is 10 MHz.
Receive active, active low. Indicates that the serial receiver is receiving a
telegram.
Transmit data. The pin can be switched to a high impedance state.
Transmit data or output port. The pins either output the serial data or can
be used as parallel output ports. When they output transmit data, each pin
can be switched to a high impedance state individual l y.
NRZ-coded transmit data.
Transmit clock for the serial interface. When regeneration is turned off
(SREGEN = 0) and the repeater is turned off, it is the clock input for the
serial transmitter; when regeneration is turned on (SREGEN = 1) it is the
output for the internally generated transmit clock. The maximum frequency
is 10 MHz.
Transmitter active, active low. When transmitting own data IDLE is 0.
Turn on test generator: TM0 = 0 switches TxD1-6 to continuous signal light,
TM1 = 0 switch-over to zero bit stream. The processor can overwrite the
level of TM1-0.
Line error, active low: goes low when signal distortion is too high or when
the receive signal is missing. The operating mode is programmed by the
processor.
SERCOS interface cycle clock: CYC_CLK synchronizes the
communication cycles. The polarity is programmable.
Control clock: becomes active within a communication cycle. Time,
polarity and width are programmable.
Divided control clock: becomes active several times within a ommunication
cycle. Number of pulses, start time, repetition rate and polarity are
programmable, the pulse width is 1 s.
Serial clock for clock regeneration: the frequency is 16 or 32 times the
baud rate, the maximum frequency is 64 MHz.
SCLK/
16 when SBAUD is 0, f
(Continued)
SCLK
Function
/32 when SBAUD is 1). Can be
SERCON410B
7/30