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rate register bit 0RR00
rate register bit 1RR11
not usedOR22
not usedOR33
not usedOR44
not usedOR55
Figure 9--- Options Register bit definitions
0111
1001
1010
0000
ID0ID1ID0ID1
READWRITE
Figure 10 --- ID bit write/read table
The rate register allows software applications to check and set the data rate
multiplier. As long as the SW jumper is installed in jumper block J9, the
DS-200/300 gets the data rate multiplier from the value stored in the rate register
portion of the OR.
921.6 kbaud *14.7456 MHzx811
460.8 kbaud *7.3728 MHzx401
230.4 kbaud3.6864 MHzx210
115.2 kbaud1.8432 MHzx100
MAX DATA RATEUART CLOCK SPEEDDATA RATE
MULTIPLIER
RR0RR1
* - with 16750 UART only
Figure 11 --- Rate Register bit definition
A read of this register will return the value for the data rate multiplier that the
board is actually operating at, regardless of what is written to the register. In other
words, even when the data rate multiplier is being controlled by the hardware
jumper setting, the value read from this register will correspond to that hardware
jumper setting. This allows applications software to detect the actual rate at
which the board is running.
At power on and reset, the rate register is initialized at 00. This means that the
DS-200/300 will power up in the x1 mode as long as the SW jumper is installed.
The DS-200/300 ships from the factory with the SW jumper installed.
5-2 Quatech Inc.