CHAPTER 5: OPERATION AND FUNCTION OF S5U1C63000H2

5.2 Break Function

●Forced break

The debugger on the host machine can forced break the emulation. This function is useful when the program counter does not proceed by executing the SLP or HALT instruction in a single step process.

●Break commands

Some break commands are available to set various breaking conditions. A break occurs when the break condition specified by the command and status of the S1C63000 CPU are met.

●Break by accessing to undefined area

This break occurs when the target program accesses an address exceeding the ROM capacity of the actual chip. The break is also occurred when any address other than the RAM area or mapped I/O area of the actual chip is accessed.

●Break by accessing write protect area

This break occurs when the target program writes data to the read only memory such as a character generator ROM. The memory contents are protected even this break occurs.

●Break by incorrect stack accessing

This break occurs when the target program makes incorrectly stacking operation exceeding the defined stack area in the S1C63000 CPU.

●BRKIN terminal

When a signal is input to the BRKIN terminal, a break occurs at the falling edge of the signal.

5.3 Monitoring Terminals

●TRGOUT output terminal

A low level pulse is output at the T3 state of the clock when the trace trigger condition and the bus cycle are met.

CLK from peripheral circuit board

PK

PL

Bus cycle

TRGOUT output

T1 T2 T3 T4

Coincidence with trace trigger

Fig. 5.3.1 TRGOUT terminal output

●STOPOUT output terminal

A low level is output when the S1C63000 CPU is suspended (by execution of the HALT or SLP instructions). This terminal also outputs low level during break.

STOPOUT output

Indicating suspension

of CPU operation

Running Breaking

Fig. 5.3.2 STOPOUT terminal output

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EPSON

S5U1C63000H2 MANUAL

 

 

(S1C63 FAMILY IN-CIRCUIT EMULATOR)