Intel 8XC196NT User Manual page 205

8XC196NT USER'S MANUAL
SSIO_BAUD
The synchronous serial port baud (SSIO_BAUD) register enables and disables the baud-rate
generator and selects the SSIO baud rate. During read operations, SSIO_BAUD serves as the down-
counter monitor. The down-counter is decremented once every four state times when the baud-rate
generator is enabled.
7
BE BV6
Bit Bit
Number Mnemonic
7 BE
6:0 BV6:0
Figure 8-5. Synchronous Serial Port Baud (SSIO_BAUD) Register
Table 8-3. Common SSIO_BAUD Values When Using XTAL1 at 20 MHz
(Maximum) 2.5 MHz
(Minimum) 19.531 kHz
†
Bit 7 must be set to enable the baud-rate generator.
8-10
BV5 BV4
Baud-rate Generator Enable
This bit enables and disables the baud-rate generator.
For write operations:
0 = disable the baud-rate generator and clear BV6:0
1 = enable the baud-rate generator and start the down-counter
For read operations:
0 = baud-rate generator is disabled
1 = baud-rate generator is enabled and down-counter is running
Baud Value
For write operations:
These bits represent BAUD_VALUE, an unsigned integer that
determines the baud rate. The maximum value of BAUD_VALUE is 7FH;
the minimum value is 0. Use the following equation to determine
BAUD_VALUE for a given baud rate.
------------------------------------- - 1
BAUD_VALUE =
Baud Rate
For read operations:
These bits contain the current value of the down-counter.
Baud Rate
100.0 kHz
50.0 kHz
25.0 kHz
Reset State:
BV3 BV2
Function
F
OSC
–
×
8
SSIO_BAUD Value
80H
98H
B1H
E3H
FFH
Address: 1FB4H
XXH
0
BV1 BV0
†