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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
Table C-13. Common SSIO_BAUD Values When Using XTAL1 at 20 MHz
Baud Rate
(Maximum) 2.5 MHz
100.0 kHz
50.0 kHz
25.0 kHz
(Minimum) 19.531 kHz
†
Bit 7 must be set to enable the baud-rate generator.
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.
F
------------------------------------- - 1
BAUD_VALUE
=
Baud Rate
For read operations:
These bits contain the current value of the down-counter.
Reset State:
BV3
BV2
Function
OSC
–
×
8
SSIO_BAUD Value
80H
98H
B1H
E3H
FFH
REGISTERS
SSIO_BAUD
Address:
1FB4H
XXH
0
BV1
BV0
†
C-57
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