ST72E121J4D0 查看數據表（PDF） - STMicroelectronics

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ST72E121J4D0

8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS

STMicroelectronics 

ST72E121 ST72T121

SERIAL COMMUNICATIONS INTERFACE (Cont’d)

EXTENDED RECEIVE PRESCALER DIVISION EXTENDED TRANSMIT PRESCALER DIVISION

REGISTER (ERPR)

REGISTER (ETPR)

Read/Write

Read/Write

Reset Value: 0000 0000 (00h)

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

Bit 7:1 = ERPR[7:0] 8-bit Extended Receive Pres- Bit 7:1 = ETPR[7:0] 8-bit Extended Transmit Pres-

caler Register.

caler 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 34) is divided by

the binary factor set in the ERPR register (in the

range 1 to 255).

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 34) is divided by

the binary factor set in the ETPR register (in the

range 1 to 255).

The extended baud rate generator is not used af- The extended baud rate generator is not used af-

ter a reset.

ter a reset.

Table 16. SCI Register Map and Reset Values

Address

(Hex.)

50

51

52

53

54

55

57

Register

Name

SR

Reset Value

DR

Reset Value

BRR

Reset Value

CR1

Reset Value

CR2

Reset Value

ERPR

Reset Value

ETPR

Reset Value

7

6

5

4

3

2

1

0

TDRE

1

DR7

-

SCP1

0

R8

-

TIE

0

ERPR7

0

ETPR7

0

TC

1

DR6

-

SCP0

0

T8

-

TCIE

0

ERPR6

0

ETPR6

0

RDRF

0

DR5

-

SCT2

x

-

RIE

0

ERPR5

0

ETPR5

0

IDLE

0

DR4

-

SCT1

x

M

-

ILIE

0

ERPR4

0

ETPR4

0

OR

0

DR3

-

SCT0

x

WAKE

-

TE

0

ERPR3

0

ETPR3

0

NF

0

DR2

-

SCR2

x

-

RE

0

ERPR2

0

ETPR2

0

FE

0

DR1

-

SCR1

x

-

RWU

0

ERPR1

0

ETPR1

0

-

0

DR0

-

SCR0

x

-

SBK

0

ERPR0

0

ETPR0

0

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