ST90135M5Q6 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST90135M5Q6

8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM

STMicroelectronics 

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ST90158 - SERIAL COMMUNICATIONS INTERFACE (SCI)

SERIAL COMMUNICATIONS INTERFACE (Cont’d)

9.5.2 Functional Description

The SCI offers four operating modes:

– Asynchronous mode

– Asynchronous mode with synchronous clock

Asynchronous mode, Asynchronous mode with

synchronous clock and Serial expansion mode

output data with the same serial frame format. The

differences lie in the data sampling clock rates

(1X, 16X) and in the protocol used.

– Serial expansion mode

– Synchronous mode

Figure 76. SCI Functional Schematic

RXclk

INTCLK

XBRG

LBEN (*)

Baud rate

generator

INPEN (*)

Divider by 16

XRX

RX buffer

register

INPL (*)

RX shift

register

1

LBEN

0

CD

OUTPL (*)

1

OCKPL (*)

AEN (*)

OCKSB (*)

OCLK

OCLK

XTCLK

Divider by 16

0

TX shift

CD register

DCDEN (*)

Polarity Polarity

TX buffer

register

Enveloper

AEN (*)

RTSEN (*)

AEN

OUTSB (*)

Sin

Sout

VR02054

TXclk / CLKout

DCD

RTS

The control signals marked with (*) are active only in synchronous mode (SMEN=1)

Note: Some pins may not be available on some devices. Refer to the device Pinout Description.

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