Motorola MSC8101 ADS User's Guide Page 218

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10-16 MSC8101 User’s Guide
Multi-Channel Controllers (MCCs)
3. Timer Reference Register (TRR). Finally, the TRR1 register is set to contain the
timeout reference value, resulting in a configuration of 0x00FF. The timer output
TOUT1 must be externally connected to L1RSYNC.
10.5 Set Up the External Interface
The CPM interface is essentially a set of I/O pins that can be configured for either a
peripheral or a general-purpose function. The multiplexed peripheral pins for TDMB are
configured through the parallel I/O port registers (PPAR, PSOR, PDIR). The driver
function InitParallelPorts() details the appropriate port registers assignment.
Note: All the CPM I/O pins default to general-purpose inputs.
Enabling the TDM involves configuring the serial interface registers. The SI Global Mode
Register (SIGMR), which is the last register to be set up in the driver before the driver is
started, defines the activation of the TDM channels for each SI. Because TDMB is used,
this register is set at 0x02.
10.6 Related Reading
MSC8101 User’s Guide (This manual)
Chapter 1, MSC8101 Overview Section 1.3.7, Communications Processor
Module (CPM), on page 1-10
Section 1.3.7.3, Buffer Descriptors, on page 1-13
MSC8101 Reference Manual
Chapter 19, Communications
Processor Module Overview
Chapter 20, Serial Interface
With Time-Slot Assigner
Chapter 22, Baud-Rate
Generators
Chapter 33, Multi-Channel
Controllers (MCCs)
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