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5.15 Using the Event Points

The emulator has the event point function that performs breaking, tracing, and execution time measurement by

specifying higher-level conditions along with the PC breakpoints standard for the HEW.

5.15.1 PC Breakpoints

When the instruction of the specified address is fetched, the user program is stopped. Up to 256 points can be set.

Note that, however, only one PC breakpoint can be set in the ROM area of the user system. This particular

breakpoint is called the on-chip breakpoint, which stops the user program after executing the instruction of the

specified address.

When it is necessary to set two or more PC breakpoints to the external ROM area of the user system, allocate

this area to the emulation memory, copy the code, and then set the PC breakpoints.

5.15.2 Event Points

Event points can be used for higher-level conditions such as the data condition as well as specification of the

single address. Up to 12 event points can be set by using event channels and range channels in the event

detection system.

When the condition is satisfied, event points are also used as the start/end conditions for execution time

measurement or trace acquisition in addition to halting the user program. Several event points can be used to set

more complex conditions.

Note: Event points acquire the data, test conditions, and execute an action (such as halting the user program)

by the hardware circuit of the emulator. Therefore, a delay of several cycles will occur from the

satisfaction of the condition to the execution of an action.

5.15.3 Event Detection System

In addition to the 4 range channels, the emulator also has 8 event channels. The event channels have more

functions (such as sequencing or counting) than the range channels.

Event Channels (Ch1 to Ch8):

The emulator has 8 event channels. The event channel can be defined as a combination of one or more of the

followings:

• An address or an address range

• Outside of an address range

• A read, a write, or either

• Data with a mask specification

• Bus state

• Area

• The value of four external probe signals

• The number of times the event has occurred

• The number of delay cycles after the event has occurred

A maximum of eight points can be used as a combination in a sequence. The program is activated or halted by an

occurrence of the previous event in each sequence.

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Renesas H8S/2628 Información técnica Pagina 258