Mitsubishi DS907x SIP User Manual page 134

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
SERIAL LOADER BAUD RATES FOR DIFFERENT CRYSTAL FREQUENCIES Table 16–1
CRYSTAL FREQ (MHz)
14.7456
11.0592
9.21600
7.37280
5.52960
1.84320
050396 133/173
300 1200
Y
Y Y
Y Y
Y Y
Y Y
Y Y
134
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.
BAUD RATE
2400 9600
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
19200 57600
Y
Y Y