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UM024002-0512 The Z8051 On-Chip Debugger

Z8051 On-Chip Debugger and In-System Programmer

User Manual

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

Break

PC+1 PC+2 PC+3

Fetch

signal

명령

operand

명령

operan

Break

detect

Handl

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Zilog Z51F0811 Manuale Utente Pagina 26