Zilog Z51F0811 - Manual (Page 26)

UM024002-0512 The Z8051 On-Chip Debugger
Z8051 On-Chip Debugger and In-System Programmer
User Manual
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Break BEFORE (AFTER)
The Break BEFORE (AFTER) function prompts the user to select a PC breakpoint event
either before or after execution. When selecting this menu option, the Break Control dia-
log box appears, prompting the user to choose one of these two conditions; see Figure 15.
Selecting Break before execution causes a PC breakpoint when the PC reaches the PC
breakpoint address; however, a PC breakpoint position will not be executed, as illustrated
in the timing diagram shown in Figure 16.
Selecting break after execution causes a PC breakpoint to occur when the PC reaches the
PC breakpoint address, and a PC breakpoint position is executed, as illustrated in the tim-
ing diagram shown in Figure 17.
Figure 15. Break Control Dialog
Figure 16. Break BEFORE Timing Diagram
PC Break
PC PC+1 PC+2 PC+3
Fetch
signal
명령 operand 명령 operan
d
Break
detect
Handl
e