ST10F269Z1Q6 datasheet(95/184 Pages) STMICROELECTRONICS

95 / 184 page

ST10F269

14 - SERIAL CHANNELS

95/184

14 - SERIAL CHANNELS

Serial communication with other microcontrollers,

microprocessors, terminals or external peripheral

components is provided by two serial interfaces:

the asynchronous / synchronous serial channel

(ASCO) and the high-speed synchronous serial

channel

(SSC).

Two

dedicated

Baud

rate

generators set up all standard Baud rates without

the

requirement

oscillator

tuning.

For

transmission, reception and erroneous reception,

3 separate interrupt vectors are provided for each

serial channel.

14.1 - Asynchronous / Synchronous Serial

Interface (ASCO)

The asynchronous / synchronous serial interface

(ASCO) provides serial communication between

the

ST10F269

and

other

microcontrollers,

microprocessors or external peripherals.

A set of registers is used to configure and to

control the ASCO serial interface:

– P3, DP3, ODP3 for pin configuration

– SOBG for Baud rate generator

– SOTBUF for transmit buffer

– SOTIC for transmit interrupt control

– SOTBIC for transmit buffer interrupt control

– SOCON for control

– SORBUF for receive buffer (read only)

– SORIC for receive interrupt control

– SOEIC for error interrupt control

14.1.1 - ASCO in Asynchronous Mode

In asynchronous mode, 8 or 9-bit data transfer,

parity generation and the number of stop bit can

be selected. Parity framing and overrun error

detection is provided to increase the reliability of

data transfers. Transmission and reception of data

is double-buffered. Full-duplex communication up

to 1.25M Bauds (at 40MHz fCPU on PQFP144

devices) and up to 1MBaud (at 32MHz fCPU on

TQFP144 devices) is supported in this mode.

Figure 44 : Asynchronous Mode of Serial Channel ASC0

CPU

Clock

S0R

Baud Rate Timer

Reload Register

Clock

Serial Port Control

Shift Clock

S0M S0STP

S0FE

S0OE

S0PE

S0REN

S0FEN

S0PEN

S0OEN

S0LB

S0RIR

S0TIR

S0EIR

Receive Interrupt

Request

Transmit Interrupt

Request

Error Interrupt

Request

Transmit Shift

Receive Shift

TXD0 / P3.10

Transmit Buffer

Receive Buffer

Sampling

MUX

Input

Internal Bus

RXD0/P3.11

Output

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