TMS77C82 datasheet(34/63 Pages) TI

34 / 63 page

TMS370CxCx

8-BIT MICROCONTROLLER

SPNS040B – NOVEMBER 1995 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

serial communications interface 2 module (continued)

Bit 2

SCIRXD DATA OUT

This bit contains the data to be output on the SCIRXD pin if the following conditions are met:

D SCIRXD pin has been defined as a general-purpose I/O pin.

D SCIRXD pin data direction has been defined as output.

Bit 3

SCIRXD DATA IN

This bit contains the current value on the SCIRXD pin.

Bit 4

SCITXD DATA DIR (SCITXD data direction)

This bit determines the data direction on the SCITXD pin if SCITXD has been defined as a

general-purpose I/O pin.

0 = SCITXD pin is a general-purpose input pin.

1 = SCITXD pin is a general-purpose output pin.

Bit 5

SCITXD FUNCTION

This bit defines the function of the SCITXD pin.

0 = SCITXD pin is a general-purpose digital I/O pin.

1 = SCITXD pin is the SCI transmit pin.

Bit 6

SCITXD DATA OUT

This bit contains the data to be output on the SCITXD pin if the following conditions are met:

D SCITXD pin has been defined as a general-purpose I/O pin.

D SCITXD pin data direction has been defined as output.

Bit 7

SCITXD DATA IN

This bit contains the current value on the SCITXD pin.

SCI priority control register (SCIPRI)

The SCIPRI register contains the receiver and transmitter interrupt-priority select bits. This register is read-only

during normal operation but can be written to in the privileged mode.

Table 26. SCI Priority Control Register (SCIPRI) [Memory Address – 105Fh]

Bit #

P05F

SCI STEST

SCITX

PRIORITY

SCIRX

PRIORITY

SCI

ESPEN

—

RP – 0

R = read, P = privilege write only, –

n = value of the bit after the register is reset

Bits 0–3

Reserved (read data is indeterminate)

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