peb20525 Infineon Technologies Corporation, peb20525 Datasheet - Page 150

• Manufacturer Part Number: peb20525
• Description: 2 Channel Serial Optimized Communication Controller For Hdlc/ppp
• Manufacturer: Infineon Technologies Corporation

Data Sheet
PPPM(1:0)
TLPO
TLP
PPP Mode Select
This bit field enables and selects the HDLC PPP protocol modes:
PPPM = ’00’ No PPP protocol operation. The HDLC sub-mode is
PPPM = ’01’ Octet synchronous PPP protocol operation.
PPPM = ’10’ Reserved
PPPM = ’11’ Bit synchronous PPP protocol operation.
Note: ’Address Mode 0’ must be selected by setting bit field ’MDS(1:0)’
Test Loop Out Function
This bit is only valid if test loop is enabled and controls whether test loop
transmit data is driven on pin TxD:
TLPO = ’0’
TLPO = ’1’
Test Loop
This bit controls the internal test loop between transmit and receive data
signals. The test loop is closed at the far end of serial transmit and
receive line just before the respective TxD and RxD pins:
TLP = ’0’
TLP = ’1’
to ’10’ and bit ’ADM’ to ’0’ if any PPP mode is enabled.
determined by bit field ’MDS’.
Test loop transmit data is driven to TxD pin.
Test loop transmit data is NOT driven to TxD pin. TxD pin
is idle ’1’. Depending on the selected output characteristic
the pin is high impedance (bit CCR1L.ODS =’0’) or driving
high (CCR1L.ODS =’1’).
Test loop disabled.
Test loop enabled.
The software is responsible to select a clock mode which
allows correct reception of transmit data depending on the
external clock supply. Transmit data is sent out via pin
TxD if not disabled with bit ’TLPO’. The receive input pin
RxD is internally disconnected during test loop operation.
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Register Description (CCR2H)
PEB 20525
PEF 20525
2000-09-14