Zilog Z80195 - Manual (Page 23)

Z80185/195 D EVELOPMENT K IT
U SER ' S M ANUAL
3-3 UM951800100
Z ILOG
TZ Program Restrictions
If the Debug Monitor is used with a dumb terminal, or with a PC running a terminal emulator other than
TZ, two commands will not work as described in this chapter:
1. An “L” command (for loading a hex file) will not be followed by the “Enter File Name:” prompt.
2. An “N” command (changing the serial data rate) will either show nonsense characters, or no
characters at all, after you type the speed-selection digit.
Monitor Debug Program and Serial Baud Rates
If you use an N command to change the baud rate between the board and the PC, both the TZ
Program on the PC and the Debug Monitor on the board change the rate simultaneously. Quitting,
starting, or pressing RESET on the board always sets the rate used by the Monitor to 9600 bps.
However, you can start TZ at any of the baud rates available by using the N command.
Type the baud rate after the COM n (where n is the COM serial port number [1–4]) argument in a DOS
command, as in the following example:
TZ COM2 57600
This third argument (as in "57000" in the preceding example) can be any of the following entrees:
1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, or 115200.
115,200 bps does not work well on many PCs and may not be offered in the Debug Monitor’s prompt
for the N command. (Refer to the following guidelines for PC configurations/baud-rate selection.)
PC Models/Serial Baud Rates
The maximum serial rate that can be used between a PC and the development kit board is dependent
upon which PC model and configuration that is used. If the baud rate is too fast for the PC, characters
will be lost during lengthy display sequences initiated by the monitor program D, U, or F commands.
Also, downloading may fail if the serial rate is too high.
PC Configuration Maximum Baud Rate (bps)
286 or 386 (slower) 19,200
386 (faster), 486, Pentium 57,600
486 (faster) and later generation 115,200
machines with serial drivers and
receivers rated for higher baud rates.
Note: Under Windows, you can use the Windows .PIF editor to make a new PIF file that includes such
a command line, and then use a File/New command under the Program Manager to make a new icon
that references the new .PIF file.