H8SLASH3003 datasheet(5/53 Pages) ETC2

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ICE-H8

Features

TRACE32 - Technical Information

Dual-port Access

All TRACE32 memories are dual-

ported. The dual-port access makes it

possible to display and modify the con-

tents of the overlay memory, to set or

delete breakpoints or use the flag

memory while the application is run-

ning in real-time.

The H8 has four dual-port modes:

t Nodelay

t Wait

t ClkSteal

t Idle

In Nodelay mode, the dual-port access

is inserted in the regular bus cycles,

generated by the CPU. This means

that the CPU runs in real time during

the dual-port access.

In Wait mode, wait states are inserted

for the dual-port access via the wait

pin. This is only possible, if the corre-

sponding pins is configured as the wait

pin.

In ClkSteal mode, the CPU clock is

stopped for some cycles during the

dual-port access. This works only if the

emulator uses the internal VCO clock.

In Idle mode, the emulator waits on idle

cycles of the CPU to perform the dual-

port access. This cycles are generated

for example during subroutine jumps.

In the

Denied Mode the dual-port

access is switched off.

Dual port access modes

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