ST72344K2 datasheet(148/247 Pages) STMICROELECTRONICS

148 / 247 page

On-chip peripherals

ST72344xx, ST2345xx

148/247

Doc ID 12321 Rev 6

Note:

This RR factor is used only when the ERPR fine tuning factor is equal to 00h; otherwise, RR

is replaced by the (RR*ERPR) dividing factor.

Extended receive prescaler division register (SCIERPR)

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 register. The clock frequency from the 16 divider (see Figure 65) 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 after a reset.

Extended transmit prescaler division register (SCIETPR)

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 register. The clock frequency from the 16 divider (see Figure 65) 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 after a reset.

ERPR7

ERPR6

ERPR5

ERPR4

ERPR3

ERPR2

ERPR1

ERPR0

Read/Write

ETPR7

ETPR6

ETPR5

ETPR4

ETPR3

ETPR2

ETPR1

ETPR0

Read/Write

Table 62.

Baud rate selection

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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