Datasheet

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C™ Slave Communications
© 2009 Microchip Technology Inc. DS51647C-page 41
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C SLAVE MODE
There are three modes of I
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C slave operation:
• Default: Basic/mechanical mode of operation in which the PICkit Serial Analyzer
blindly accepts any/all ‘write’ data and provides canned/default ‘read’ data in
response to any enabled I
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C address and all device addresses.
• Interactive: This mode allows the host to orchestrate I
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C transactions in ‘real
time’. This necessarily requires the host to provide ‘read’ and ‘receive’ data as
needed while the PICkit Serial Analyzer holds the I
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C bus clock line (waiting).
‘Write’ data is reported to the host via transaction event tags.
• Automatic: In Auto mode the PICkit Serial Analyzer operates autonomously as
defined by a dynamic “slave profile” table stored in PICkit Serial Analyzer RAM. At
any time the host can read and/or update the table as needed.
SCRIPT TIME-OUT
When the slave responds to Read and Receive queries the software will wait a maxi-
mum of script time-out ms to receive a script complete tag before issuing an error. If
your slave profile is responding with large amounts of data, you may need to increase
the script time-out to avoid errors.
FIGURE 5-2: I
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C™ SLAVE CONFIGURE COMMUNICATIONS MODE –
ADVANCED VIEW
EVENT MARKERS
• Abrt Mac Exe – Enable event marker: abort ‘macro’ execution
• Macro Loop – Enable event marker: top of ‘macro’ loop
• Mac Lp 65536 – Enable event marker: ‘macro’ loop count overflow (i.e., 65536)
• Mac Lp Done – Enable event marker: ‘macro’ loop iterations complete
• Timeout Timer1 – Enable event marker: Timer1 expired
• Timeout Timer2 – Enable event marker: Timer2 expired
• Status Error – Enable event marker: change in status byte
• Addr RX – Enable event marker: Slave address received
• Data RX – Enable event marker: Data received
• Data TX – Enable event marker: Data transmitted
• Ack RX
– Enable event marker: Ack byte received