5. Each Component Function
68
User’s Manual
Table 5.12. Function of Each Register < 4 / 4 >
MSR : Modem Status Register
D7
D6
D5
D4
D3
D2
D1
D0
03FEH
I/O address
Description
SCR : Scratchpad Register
03FFH
DCD RI DSR CTS
DDCD TERI DDSR DCTS
Delta CTS
Delta DSR
Trailing edge RI
Delta data carrier detect
CTS
DSR
RI
DCD
This is an 8-bit, readable/writable register which is available to the user to
allow data to be saved temporarily.
Since these
statuses are
not used with
RS-485, data
is not valid.
Baud Rate Settings
A baud rate is set by software by dividing the clock input (1.8432MHz). The baud rate in terms of
hardware can be set to a maximum of 115,200 bps for SERIAL1, 2 and 230,400bps for SERIAL3 - 6.
The baud rates available in practice depend on the operating environment (cable, software, etc.). The
table below lists typical baud rates and their respective values to be written to the divisor latch register
(LSB, MSB).
