User guide

DC 900-1338I 191
Appendix
B
Data Rate Time Constants for
SCC/IUSC Programming
This appendix provides some commonly used baud rate time constants for SCC/IUSC
programming on the ICP.
Ta bl e B –1 shows SCC time constants for 1X mode for the ICP6000, normally used for
all synchronous communication modes. To select 1X mode, set bits 7 and 6 in SCC
write register 4 to 00 (binary).
Ta bl e B –2 shows SCC time constants for 16X mode for the ICP6000, normally used for
asynchronous mode. To select 16X mode, set bits 7 and 6 in SCC write register 4 to 01
(binary).
The SCC time constant is a 16-bit value. The most significant byte (MSB) is stored in
SCC write register 13, and the least significant byte (LSB) is stored in SCC write register
12.
Ta bl e B –3 shows IUSC time constants for 1X mode for the ICP2424 and ICP2432, nor-
mally used for all synchronous communication modes. Ta ble B –4 shows IUSC time
constants for 16X mode for the ICP2424 and ICP2432, normally used for asynchronous
mode. Set the required clock mode in the Channel Mode register of the IUSC.
The IUSC time constant is a 16-bit value stored in Time Constant register 0 or 1.