C515C
Figure 15
Block Diagram of Baud Rate Generation for the Serial Interface
Table 8
below lists the values/formulas for the baud rate calculation of the serial interface with its
dependencies of the control bits BD and SMOD.
Table 8
Serial Interface - Baud Rate Dependencies
Serial Interface
Operating Modes
Mode 0 (Shift Register)
Mode 1 (8-bit UART)
Mode 3 (9-bit UART)
Active Control Bits Baud Rate Calculation
BD
鈥?/div>
0
1
SMOD
鈥?/div>
X
X
f
OSC
/ 6
Controlled by timer 1 overflow :
(2
SMOD
脳
timer 1 overflow rate) / 32
Controlled by baud rate generator
(2
SMOD
脳
f
OSC
) /
(32
脳
baud rate generator overflow rate)
Mode 2 (9-bit UART)
鈥?/div>
0
1
f
OSC
/ 32
f
OSC
/ 16
Semiconductor Group
39
1997-07-01
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