ST72340 datasheet(113/191 Pages) STMICROELECTRONICS

113 / 191 page

ST72340, ST72344, ST72345

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SCI SERIAL COMMUNICATION INTERFACE (Cont’d)

EXTENDED RECEIVE PRESCALER DIVISION

Read/Write

Reset Value: 0000 0000 (00h)

Bits 7:0 = ERPR[7:0] 8-bit Extended Receive

Prescaler Register.

The extended Baud Rate Generator is activated

when a value other than 00h is stored in this regis-

ter. The clock frequency from the 16 divider (see

Figure 3) is divided by the binary factor set in the

SCIERPR register (in the range 1 to 255).

The extended baud rate generator is not active af-

ter a reset.

EXTENDED TRANSMIT PRESCALER DIVISION

Read/Write

Reset Value:0000 0000 (00h)

Bits 7:0 = ETPR[7:0] 8-bit Extended Transmit

Prescaler Register.

The extended Baud Rate Generator is activated

when a value other than 00h is stored in this regis-

ter. The clock frequency from the 16 divider (see

Figure 3) is divided by the binary factor set in the

SCIETPR register (in the range 1 to 255).

The extended baud rate generator is not active af-

ter a reset.

Table 22. Baud Rate Selection

ERPR

ETPR

Symbol

Parameter

Conditions

Standard

Baud

Rate

Unit

fCPU

Accuracy vs.

Standard

Prescaler

fTx

fRx

Communication

frequency

8MHz

~0.16%

Conventional Mode

TR (or RR) = 128, PR = 13

TR (or RR) = 32, PR = 13

TR (or RR) = 16, PR =13

TR (or RR) = 8, PR = 13

TR (or RR) = 4, PR = 13

TR (or RR) = 16, PR = 3

TR (or RR) = 2, PR = 13

TR (or RR) = 1, PR = 13

300

1200

2400

4800

9600

10400

19200

38400

~300.48

~1201.92

~2403.84

~4807.69

~9615.38

~10416.67

~19230.77

~38461.54

~0.79%

Extended Mode

ETPR (or ERPR) = 35,

TR (or RR) = 1, PR = 1

14400 ~14285.71

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