HC05 datasheet(116/232 Pages) MOTOROLA

116 / 232 page

MOTOROLA

7-14

MC68HC05X16

Rev. 1

SERIAL COMMUNICATIONS INTERFACE

7.11.3

Serial communications control register 2 (SCCR2)

The SCI control register 2 (SCCR2) provides the control bits that enable/disable individual SCI

functions.

TIE — Transmit interrupt enable

1 (set)

–

TDRE interrupts enabled.

0 (clear) –

TDRE interrupts disabled.

TCIE — Transmit complete interrupt enable

1 (set)

–

TC interrupts enabled.

0 (clear) –

TC interrupts disabled.

RIE — Receiver interrupt enable

1 (set)

–

RDRF and OR interrupts enabled.

0 (clear) –

RDRF and OR interrupts disabled.

ILIE — Idle line interrupt enable

1 (set)

–

IDLE interrupts enabled.

0 (clear) –

IDLE interrupts disabled.

TE — Transmitter enable

When the transmit enable bit is set, the transmit shift register output is applied to the TDO line and

the corresponding clocks are applied to the SCLK pin. Depending on the state of control bit M

(SCCR1), a preamble of 10 (M = 0) or 11 (M = 1) consecutive ones is transmitted when software

sets the TE bit from a cleared state.

If a transmission is in progress and a zero is written to TE, the transmitter will wait until after the

present byte has been transmitted before placing the TDO and the SCLK pin in the idle, high

impedance state.

If the TE bit has been written to a zero and then set to a one before the current byte is transmitted,

the transmitter will wait for that byte to be transmitted and will then initiate transmission of a new

preamble. After this latest transmission, and provided the TDRE bit is set (no new data to transmit),

the line remains idle (driven high while TE = 1); otherwise, normal transmission occurs. This

function allows the user to neatly terminate a transmission sequence.

Address

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

State

on reset

SCI control (SCCR2)

$000F

TIE

TCIE

RIE

ILIE

RWU

SBK

0000 0000

114

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