Contec IPC-BX/M560, Руководство пользователя

Страница: 59 / 90

Functions of Components
IPC-BX/M560(PCW)
48
Table 5.10. Register Functions
<4/4>
MSR : Modem Status Register
D7 D6 D5 D4 D3 D2 D1 D0
03FEH
I/O address Contents
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
8bit readable/writable register. The user can use this register for temporarily
saving data.
Since these status are
not used for RS-485,
data is invalid.
Setting the baud rate
The baud rate is set with software by dividing the clock input
(1.8432MHz). The baud rate is set by writing the corresponding
values to the divisor latch registers (LSB, MSB) as shown below:
Table 5.11. Baud Rate Settings
Setting error (%)
50 2304 ---
75 1536 ---
110 1047 0.026
134 .5 857 0.058
150 768 ---
300 384 ---
600 192 ---
1200 96 ---
1800 64 ---
2000 58 0.69
2400 48 ---
3600 32 ---
4800 24 ---
7200 16 ---
9600 12 ---
19200 6 ---
Example: To set 9600bps, write 00 and 12 (decimal) to the divisor latch registers
(MSB and LSB), respectively.
Baud rate Value written to divisor latch registers