Zilog Z80195 Manual de usuario descargar pdf (Pagina 27)

Z80185/195 DEVELOPMENT KIT

USER'S MANUAL

3-7

UM951800100

ZILOG

Edit/Display I/O Data [E]

This command allows editing or display of registers in I/O space. First, the program asks for a starting

address, which can be 16 bits. Then it asks for the number of registers to display. If you enter "0" or

just a <RETURN>, you enter Editing mode. If you enter a nonzero value, that number of I/O registers

will be displayed following the starting address.

Example of Display Mode:

Z80185 > Edit/Display Starting at I/O Register: 40

Display How Many Bytes (just CR to Edit): 10

0040 78 78 78 78 78 78 78 78 78 78 78 78 78 78 78 78

Z80185>

In Editing mode, the program displays what it reads from each I/O location. Entering a hex value

followed by a valid terminating character (not including <ESC>) will make the program write the

entered value to the location. The program recognizes the following terminating characters:

<ESC> Does not store a preceding value and returns to the command prompt.

. Stores a preceding value if any and returns to the command prompt.

= Stores a preceding value if any, stays at the same location, re-reads and re-

displays.

CR,tab,Space,+,> Stores a preceding value if any, and go to the next location.

-,<,^ Stores a preceding value if any, and go to previous location.

In addition to these, a backspace character after a hex character “unenters” one hex character.

With the original Z80 Family, I/O addresses were 8-bit wide and thus I/O space was 256 bytes long.

In the Z180 Family (this monitor program), I/O addresses are treated as 16-bits wide, thus I/O space

contains 65,536 bytes. The Z180 peripherals appear only on the first 256-byte page, in addressees

0000 -003F unless they have been reallocated by software to 0040-007F or 0080-00BF. The unique

peripherals of the Z80185/195 may appear in every page or only the first page depending on a

programmable bit in the I/O register.

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Zilog Z80195 Manual de usuario Pagina 27