ST72521AR7TC View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72521AR7TC

8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE

STMicroelectronics 

ST72521M/R/AR

SERIAL COMMUNICATIONS INTERFACE (Cont’d)

EXTENDED RECEIVE PRESCALER DIVISION EXTENDED TRANSMIT PRESCALER DIVISION

REGISTER (SCIERPR)

REGISTER (SCIETPR)

Read/Write

Read/Write

Reset Value: 0000 0000 (00 h)

Reset Value:0000 0000 (00h)

Allows setting of the Extended Prescaler rate divi- Allows setting of the External Prescaler rate divi-

sion factor for the receive circuit.

sion factor for the transmit circuit.

7

0

ERPR ERPR ERPR ERPR ERPR ERPR ERPR ERPR

7

6

5

4

3

2

1

0

7

0

ETPR ETPR ETPR ETPR ETPR ETPR ETPR ETPR

7

6

5

4

3

2

1

0

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

Prescaler Register.

The extended Baud Rate Generator is activated

when a value different from 00h is stored in this

register. Therefore the clock frequency issued

from the 16 divider (see Figure 62) is divided by

the binary factor set in the SCIERPR register (in

the range 1 to 255).

The extended baud rate generator is not used af-

ter a reset.

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

Prescaler Register.

The extended Baud Rate Generator is activated

when a value different from 00h is stored in this

register. Therefore the clock frequency issued

from the 16 divider (see Figure 62) is divided by

the binary factor set in the SCIETPR register (in

the range 1 to 255).

The extended baud rate generator is not used af-

ter a reset.

Table 22. Baudrate Selection

Symbol

Parameter

Conditions

fCPU

Accuracy

vs. Standard

Prescaler

Conventional Mode

TR (or RR)=128, PR=13

TR (or RR)= 32, PR=13

TR (or RR)= 16, PR=13

~0.16%

TR (or RR)= 8, PR=13

fTx

Communication frequency 8MHz

fRx

TR (or RR)= 4, PR=13

TR (or RR)= 16, PR= 3

TR (or RR)= 2, PR=13

TR (or RR)= 1, PR=13

~0.79%

Extended Mode

ETPR (or ERPR) = 35,

TR (or RR)= 1, PR=1

Standard

Baud

Rate

Unit

300 ~300.48

1200 ~1201.92

2400 ~2403.84

4800 ~4807.69

9600 ~9615.38

10400 ~10416.67 Hz

19200 ~19230.77

38400 ~38461.54

14400 ~14285.71

112/199

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