ST10F269Z2QX datasheet(91/161 Pages) STMICROELECTRONICS

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ST10F269Z2Qx

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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 of

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 ST10F269Z2Qx 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 communica-

tion up to 1.25M Bauds (at 40MHz of fCPU) is sup-

ported 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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