Serial I/O: UART Baud Rate Selection

• frames up to 8-kilobits long

UART BAUD RATE SELECTION

The clock sources for each SCC are defined in the SICR register (FF00,0AEC16) and for each SMC are defined in the SIMODE register (FF00,0AE016). Any one of four internal baud rate generators or an external clock may be used.

The internal baud rate generators are contained in the CPM. They can deliver a maximum baud rate at one half of the system clock rate and may be changed on-the-fly. Each baud rate generator may be routed to multiple SCCs and SMCs.

The baud rate produced by a generator is set within the corresponding Baud Rate Generator Control (BRGC) register (FF00,09F0 - 9FC16). The baud rate is calculated from the system frequency (40 MHz) and the values stored in the BRGC register, and depends on whether the serial controller is operating in asynchronous or synchronous mode.

The formula for the asynchronous baud rate is:

async baud rate = (system frequency) ÷ ((clock divider +1) x (Div16) x 16)

The clock divider value is stored in bits (12:1) of the BRGC. The Div16 value (1 or 16) is selected with bit 0 of the BRGC. Table 5-4lists the clock divider and Div16 values associated with typical asynchronous baud rates.

Table 5-4:Asynchronous Baud Rates (16X oversample)

 

 

System Frequency=40 MHz

 

Baud

Div16

 

 

Frequency Error

Rate:

Value:

Clock Divider + 1:

Actual Frequency:

(%):

50

16

3125

50

0.0

 

 

 

 

 

75

16

2083

75

0.0

 

 

 

 

 

150

16

1041

150.1

0.0

 

 

 

 

 

300

16

521

299.9

0.0

 

 

 

 

 

600

1

4167

599.95

0.0

 

 

 

 

 

1200

1

2083

1200.2

0.0

 

 

 

 

 

2400

1

1042

2399.2

0.0

 

 

 

 

 

4800

1

521

4798.5

0.0

 

 

 

 

 

9600

1

260

9615.4

0.2

 

 

 

 

 

19200

1

130

19230.8

0.2

 

 

 

 

 

38400

1

65

38461.5

0.2

 

 

 

 

 

57600

1

43

58139.5

0.9

 

 

 

 

 

64000

1

39

64102.6

0.2

 

 

 

 

 

115200

1

22

113636.4

1.4

 

 

 

 

 

56000

1

45

55555.6

0.8

 

 

 

 

 

5-6

PmT1 and PmE1 User’s Manual

10002367-02

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Emerson PME1, PMT1 user manual Serial I/O Uart Baud Rate Selection
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PMT1, PME1 specifications

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