Motorola CPU32 Betriebsanweisung PDF herunterladen (Seite 84)

CPU32 Emulation 83

Chapter 5: Connecting and Configuring the Emulator

Configuring the Emulator

Emulation probe

• If your target system runs at a default clock rate less than 8 MHz

but greater than 131 kHz, set switch S2 to OFF.

Detailed information about processor clock

rates

Most target systems will communicate with the emulator properly and

with excellent performance following the basic guidelines given in the

preceding sections. In some target systems, the setting of this

parameter requires greater knowledge of the actual clock generation

model.

The CPU32 family has two major use models for the processor clock

rate which can be used to support the majority of target systems. When

using the internal clock synthesizer, the processor will run from reset

at a Motorola defined default clock rate which, when using the

Motorola recommended crystal is usually 8.38 MHz or 1/2 of the

maximum clock rate of the processor. The programmer’s initialization

code then programs the clock synthesizer to run at the desired clock

rate which is usually higher than the default. The second model uses an

external clock source to directly control the processor clock rate. The

emulator directly supports both processor clock rate models. Users

that use a different clock rate model can examine the support of these

models to determine the correct settings for supporting their processor

clock rate.

The emulator supports the use model of the target processor clock rate

being increased through the configuration. When applying the

configuration at the start of a user interface or through the

configuration process, the emulator communicates with the target

processor at a rate based on the default processor clock rate (either 8

MHz or 131 kHz). At this default rate, it copies the EMSYNCR

(EMulator copy of the SYNthesizer Control Register) to the SYNCR

(SYNthesizer Control Register). The emulator then changes its

communications rate to the maximum rate that the processor clock

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Motorola CPU32 Betriebsanweisung Seite 84