Rabbit 2000 - Page 229

User’s Manual 223
clocked serial ports (Ports A–
B) ................................125
clocked serial timing .......128
controlling RS-485 driver and
receiver .......................131
data and parity bits ..........119
data framing/Modbus ......135
extra stop bits, parity ....... 132
generating periodic inter-
rupts ............................131
interrupt service routines 129
interrupts .........................123
master/slave protocol ......135
receive serial data timing 124
registers ...........................120
software recommendations 129
synchronous serial port ... 208
transmit serial data timing 124
transmitting and detecting
breaks ..........................131
transmitting dummy charac-
ters ..............................131
slave port .......................46, 137
applications .....................145
hardware design ..............143
messaging protocol ......... 146
protocols ..........................145
R/W cycles ......................139
registers ...........................143
typical connections .........142
specifications
DC characteristics ............. 61
3.3 V .............................. 63
5.0 V .............................. 62
I/O buffer sinking and sourc-
ing limits ....................... 64
memory access times ...... 151
power consumption .........162
spectrum spreader .......150, 215
system clock ...........................8
T
timers ..................................111
Timer A ...........................113
Timer B ...........................115
W
watchdog timer ..................... 80
X
XPC register .........................18