Regarding The Monitor Pins - Epson S5U1C33001H1400 Manual

4. NAME AND FUNCTION OF EACH PART
4.1.4

Regarding the monitor pins

• GND pin (black (left side in the above diagram))
• BRK IN pin (red)
• TRC IN pin (white)
• TRG OUT pin (light blue)
10
To monitor the signals output from the above pins, connect the GND of a measuring
instrument such as an oscilloscope to this pin. If the ground level between the
S5U1C33001H and the target system is unstable (particularly when the 4-pin cable is
used), this pin can be used to stabilize the ground level.
If a low-level signal is input to this pin when the target program is being executed, the
target program execution is suspended. After a low level is input to the BRK IN
terminal, a break will occur after a few instructions have been executed.
This pin inputs an external trace signal. The input signal can also be traced when the
bus trace is performed.
The TRG OUT pin outputs trace trigger signals indicating the start and end of the trace.
To perform an area trace with the S5U1C33001H, set two trigger points: the start
address and end address of the trace area. When the execution address of the program
corresponds to the set trace trigger point, the TRG OUT pin outputs a High-level signal.
It also outputs a High-level signal when target program execution is suspended. For a
discussion of how to set the trace function, see the "Debugger" section in the
S5U1C33001C Manual (C Compiler Package for S1C33 Family). The output timing is
shown below. To generate trace trigger signals, you must run the program for trace
trigger point 1 and point 2, in that order. Shown below are states in which trace triggers
are and are not generated.
EPSON
S5U1C33001H1400 Manual (Rev. 0.20)
S1C33 Family In-Circuit Debugger