USER'S GUIDE

AUTO±BAUD RATE DETECTION

The Serial Bootstrap Loader has the capability of deter- mining which of the six supported baud rate frequencies is being used for communication and initializing its inter- nal hardware for communication at that frequency. When the Program Load mode is first invoked, the de- vice will watch for activity on the serial port. If a <CR> character is received at one of the six supported baud rates, then operation in the Serial Program Load mode will be established. The loader expects to talk asynchro- nously at 300, 1200, 2400, 9600, 19200, or 57600 baud

using eight data bits, no parity, and one stop bit in full du- plex. A break signal followed by a carriage return will cause a re±determination of baud rate. Although an 11.0592 MHz crystal is standard for generating baud rates, the auto±baud rate detector allows a variety of crystals to be used. If a crystal frequency other than 11.0592 MHz is used, then the baud rate frequencies which will be recognized by the serial loader are shown in Table 16±1. Other crystals will generate non±stan- dard band rates.

SERIAL LOADER BAUD RATES FOR DIFFERENT CRYSTAL FREQUENCIES Table 16±1

 

 

 

BAUD RATE

 

 

 

 

 

 

 

 

 

CRYSTAL FREQ (MHz)

300

1200

2400

9600

19200

57600

 

 

 

 

 

 

 

14.7456

 

Y

Y

Y

Y

 

11.0592

Y

Y

Y

Y

Y

Y

9.21600

Y

Y

Y

Y

 

 

7.37280

Y

Y

Y

Y

 

 

5.52960

Y

Y

Y

Y

 

 

1.84320

Y

Y

Y

Y

 

 

 

 

 

 

 

 

 

050396 133/173

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Mitsubishi DS907x SIP, DS5000TK manual AUTO±BAUD Rate Detection, Baud Rate, Crystal Freq MHz 300 1200 2400, 57600
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