ST90135 datasheet(165/190 Pages) STMICROELECTRONICS

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ST90158 - SERIAL COMMUNICATIONS INTERFACE (SCI)

SERIAL COMMUNICATIONS INTERFACE (Cont’d)

SYNCHRONOUS OUTPUT CONTROL (SOCR)

R255 - Read/Write

Reset value: 0000 0001 (01h)

Bit 7 = OUTPL:

SOUT Output Polarity.

0: Polarity not inverted.

1: Polarity inverted.

Note: OUTPL only affects the data sent by the

transmitter section. In Auto-Echo mode SOUT =

SIN even if OUTPL=1. In Loop-Back mode, the

state of OUTPL is irrelevant.

Bit 6 = OUTSB:

SOUT Output Stand-By Level.

0: SOUT stand-by level is HIGH.

1: SOUT stand-by level is LOW.

Bit 5 = OCKPL:

Transmitter Clock Polarity.

0: CLKOUT is active on the rising edge.

1: CLKOUT is active on the falling edge.

Note: OCKPL only affects the transmitter clock. In

Auto-Echo mode CLKOUT = RXCLK independ-

ently of the state of OCKPL. In Loop-Back mode

the state of OCKPL is irrelevant.

Bit 4 = OCKSB:

Transmitter Clock Stand-By Lev-

el.

0: The CLKOUT stand-by level is HIGH.

1: The CLKOUT stand-by level is LOW.

Bit 3 = RTSEN:

RTS and SDS Output Enable.

0: Disable the RTS and SDS hardware synchroni-

sation.

1: Enable the RTS and SDS hardware synchroni-

sation.

Notes:

– When RTSEN is set, the RTS output becomes

active just before the first active edge of CLK-

OUT and indicates to target device that the MCU

is about to send a synchronous frame; it returns

to its stand-by value just after the last active edge

of CLKOUT (MSB transmitted).

– When RTSEN is set, the SDS output becomes

active high and indicates to the target device that

the MCU is about to send the first bit of a syn-

chronous frame on the Serial Output Pin

(SOUT); it returns to low level as soon as the

second bit is sent on the Serial Output Pin

(SOUT). In this way a positive pulse is generated

each time that the first bit of a synchronous frame

is present on the Serial Output Pin (SOUT).

Bit 2 = RTSPL:

RTS Output Polarity.

0: The RTS output is active when LOW.

1: The RTS output is active when HIGH.

Note: RTSPL only affects the RTS activity on the

output pin. In Auto-Echo mode RTS = DCD inde-

pendently from the RTSPL value. In Loop-Back

mode RTSPL value is ’Don’t Care’.

Bit 1 = OUTDIS:

Disable all outputs.

This feature is available on specific devices only

(see device pin-out description).

When OUTDIS=1, all output pins (if configured in

Alternate Function mode) will be put in High Im-

pedance for networking.

0: SOUT/CLKOUT/enabled

1: SOUT/CLKOUT/RTS put in high impedance

Bit 0 = “Don’t Care”

OUTP

OUTS

OCKP

OCKS

RTSE

RTS

OUT

DIS

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