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Debug for 8- and 16-Bit Devices
EXAMPLE 7-3:
dsPIC33F DEVICE RUNNING AT 10 MIPS WITH C PROJECT
Native
SPI
I/O Port
Library Size (in instructions)
GPRs Used (in bytes)
__TRACE(id) instruction cycles
__LOG(id, INT) instruction cycles
87 + 9
18
80
212
92 + 9
14
53
124
93 + 9
0
32
106
EXAMPLE 7-4:
dsPIC33F DEVICE RUNNING AT 16 MIPS WITH C PROJECT
Native
SPI
I/O Port
__TRACE(id) instruction cycles
__LOG(id, INT) instruction cycles
88
227
53
138
32
106
EXAMPLE 7-5:
dsPIC33F DEVICE RUNNING AT 34 MIPS WITH C PROJECT
Native
SPI
I/O Port
__TRACE(id) instruction cycles
__LOG(id, INT) instruction cycles
7.3.10
More on Trace/Log ID Numbers
100
251
53
152
32
106
MPLAB IDE will automatically generate the ID numbers required for a trace or log
macro. However, to understand the method behind the numbering, read further.
You can have 64 trace points and 128 log points. These limits are determined by port
trace (8 bits). Bit 7 is used as a clock, thus leaving 7 bits for data (128). Bit 6 is a flag
which indicates a trace record instead of a log record.
For a trace record (bit 6 is 1), the low order bits represent the trace number (nnnnnn).
You could say 0-63 are the legal trace numbers and require the trace flag be set, but it
was just easier to combine the flag with the number and say the valid numbers are
64-127.
clock
1
n
n
n
n
n
n
bit 7
bit 0
For a log record (bit 6 is 0), the low order bits identify the data type (t) and the log
number is sent in the next byte (nnnnnnn), thus freeing up a full 128 values.
clock
0
t
t
t
t
t
t
bit 7
bit 0
clock
n
n
n
n
n
n
n
? 2008 Microchip Technology Inc.
bit 7
bit 0
DS51616B-page 73
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