Ssio Baud-Rate Control Register (Ssiobaud) - Intel 386 User Manual

Intel386™ EX EMBEDDED MICROPROCESSOR USER'S MANUAL

13.3.4 SSIO Baud-rate Control Register (SSIOBAUD)

Use SSIOBAUD to enable the baud-rate generator and determine the baud-rate generator's sev-
en-bit down counter's reload value (BV).
SSIO Baud-rate Control
SSIOBAUD
(read/write)
7
BEN BV6
Bit Bit
Number Mnemonic
7 BEN
6–0 BV6:0
Figure 13-18. SSIO Baud-rate Control Register (SSIOBAUD)
13-20
BV5 BV4
Baud-rate Generator Enable:
Setting this bit enables the baud-rate generator. Clearing this bit disables
the baud-rate generator, clears the baud-rate count value, and forces the
baud rate clock to zero.
Baud-rate Value:
The baud-rate value (BV) is the reload value for the baud-rate
generator's seven-bit down counter. The baud-rate generator's output is
a function of BV and the baud-rate generator's input (BCLKIN), as
follows.
baud-rate output frequency (Hz)
If you know the desired output baud-rate frequency, you can determine
BV as follows.
BV -------------------------------------------------------------------------------- -
=
2 baud-rate output frequency
Expanded Addr: F484H
ISA Addr: —
Reset State: 00H
BV3 BV2
Function
BCLKIN
= --------------------- -
2BV 2
+
BCLKIN
1
–
0
BV1 BV0
(Hz)