Intel 8XC196K Series User Manual page 172

Table of Contents

SP_BAUD (Continued)

The serial port baud rate (SP_BAUD) register selects the serial port baud rate and clock source. The

most-significant bit selects the clock source. The lower 15 bits represent BAUD_VALUE, an unsigned

integer that determines the baud rate.

The maximum BAUD_VALUE is 32,767 (7FFFH). In asynchronous modes 1, 2, and 3, the minimum

BAUD_VALUE is 0000H when using XTAL1 and 0001H when using T1CLK. In synchronous mode 0, the

minimum BAUD_VALUE is 0001H for transmissions and 0002H for receptions.

On the 87C196CA, 8XC196J x devices the T1CLK pin is not implemented; therefore, on these devices

this bit is reserved and should be written as one.

Figure 7-7. Serial Port Baud Rate (SP_BAUD) Register (Continued)

These bits constitute the BAUD_VALUE.

Use the following equations to determine the BAUD_VALUE for a given

Synchronous mode 0:

------------------------------------- - 1

Asynchronous modes 1, 2, and 3:

---------------------------------------- - 1

For mode 0 receptions, the BAUD_VALUE must be 0002H or greater.

Otherwise, the resulting data in the receive shift register will be incorrect.

SERIAL I/O (SIO) PORT

Reset State:

--------------------------- -

------------------------------------- -