AMX 68000 User Manual download pdf (Page 39)

AMX 68000 Target Guide

DAK

ISP Type

Your fast clock ISP is identified as such by selecting Fast Clock Handler from the pull

down list.

ISP Root

Edit the default name ---New--- to provide the name you wish to give to your fast clock

ISP root. The ISP root name is used to identify your fast clock ISP in the ISP list.

The ISP root is a function created by the AMX Configuration Builder in your Target

Configuration Module. The function entry point is declared with a public symbol defined

with the name you provide. The name must be unique and must conform to the symbol

naming conventions of your assembler.

Clock Service

Your clock device will be serviced as follows:

Write Value #1 to the device port at memory Address #1.

Delay for the number of µs defined as I/O Delay (µs).

Write Value #2 to the device port at memory Address #2.

Address and Value

Each address parameter specifies the 32-bit, hexadecimal value of an absolute memory

address which, when referenced as an n-bit value, is decoded by your target hardware as

a reference to your clock device. Each value parameter is an n-bit, hexadecimal value

which must be written to the device port specified by the associated address in order to

dismiss the clock interrupt.

If your clock device only requires that one value be written to one device port, leave

fields Address #2 and Value #2 blank (empty).

I/O Delay (µs)

Your target hardware may not operate correctly if two sequential device I/O references

are issued at the processor's instruction execution speeds. If this is the case, you can

force the fast clock ISP to inject a delay of

n µs between the I/O device references by

entering a non-zero value into this field.

If your clock device requires no delay or only requires that one value be written to one

device port, leave the

I/O Delay field blank (empty).

Write Size

From the pull down list, select the number of bits (8, 16 or 32) which must be written to

the clock device. The least significant n bits of each value will be written to the device.

1 ... 38 39 40 ... 90

No comments

AMX 68000 User Manual Page 39