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3.1.5 Bus Monitoring

The emulator incorporates a bus monitoring function that monitors and displays the contents of the accessed area

in HEW windows without stopping the program execution. Up to eight blocks of 256 bytes can be monitored.

In addition, the emulator can output trigger signals from external probe 2 (EXT2) when specified addresses (four

points max.) are accessed. Note that, however, some products do not support the bus monitoring function.

3.2 Complex Event System (CES)

In most practical debugging applications, the program or hardware errors that you are trying to debug occur

under a certain restricted set of circumstances. For example, a hardware error may only occur after a specific

area of memory has been accessed. Tracking down such problems using simple PC breakpoints can be very

time-consuming.

The emulator provides a very sophisticated system for giving a precise description of the conditions you want to

examine, called the complex event system. This allows you to define events which depend on the state of a

specified combination of the MCU signals.

The complex event system provides a unified way of controlling the trace, break, and timing functions of the

emulator.

3.2.1 Event Channels

The event channels allow you to detect when a specified event has occurred. The event can be defined as a

combination of one or more of the followings:

• Address or address range

• Address outside range

• Read or Write or either

• Data, with an optional mask

• MCU access type (e.g., DMAC and instruction prefetch)

• MCU access area (e.g., on-chip ROM and on-chip RAM)

• A signal state on one or more of the four external probes

• A certain number of times that the event must be triggered

• Delay cycles after an event

Up to eight events can be combined into a sequence, in which each event is either activated or deactivated by the

occurrence of the previous event in the sequence. For example, you can cause a break if an I/O register is written

to after a specified area of RAM has been accessed.

3.2.2 Range Channels

The range channels can be set up to be triggered on a combination of one or more of the following:

• Address or address range (inside the range)

• Read or Write or either

• Data, with an optional mask

• MCU access type (e.g., DMAC and instruction prefetch)

• MCU access area (e.g., on-chip ROM and on-chip RAM)

• A signal state on one or more of the four external probes

• Delay cycles after an event

The complex event system can be used to control the following functions of the emulator:

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