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PICkit? SERIAL ANALYZER
USER ’S GUIDE
Chapter 9. PICkit? Serial Analyzer Firmware
9.1
9.2
INTRODUCTION
This chapter explains the internal operations of the PICkit? Serial Analyzer firmware.
The source code is available on the PICkit Serial Analyzer CD-ROM at D:\PICkit Serial
Analyzer\Firmware.
HIGHLIGHTS
This chapter discusses:
?
?
?
?
?
EXEC
COMM
I 2 CM Communications
SPI Communications
USART Communications
9.3
OVERVIEW
Internally, the PICkit? Serial Analyzer operates two firmware state controllers running
in parallel – EXEC (executive) and COMM (communication). The EXEC controller is
responsible for overall PICkit? Serial Analyzer configuration, moving data to/from the
host (via USB) and moving data to/from the COMM controller (via RAM buffers). The
COMM controller supervises serial communication with the target device. This includes
both configuring the necessary communication hardware and executing a sequential
‘script’ defining a serial ‘transaction’.
FIGURE 9-1:
ARCHITECTURE
ARCHITECTURE
USB
EXEC
CONTROL
STATUS
COMM
CONTROL
H
EP0-OUT
CIRCULAR
O
BUFFERS
D
S
T
EP0-IN
EP1-OUT
EP1-IN
CBUF
(scratch)
CBUF1
(script/data)
CBUF2
I 2 C?
SPI
USART
E
V
I
C
E
(output/data)
Data streams associated with PICkit? Serial Analyzer are formatted with markers
called “TAG” bytes. A TAG may be stand-alone or accompanied by data. As seen in
Table 9-1, the data stream for each state controller has a set of associated TAG bytes
defined in detail later in the document.
? 2007 Microchip Technology Inc.
DS51647A-page 73
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