PC912XDP512F0MPVR datasheet(488/1348 Pages) FREESCALE

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Chapter 11 Serial Communication Interface (S12SCIV5)

MC9S12XDP512 Data Sheet, Rev. 2.21

488

Freescale Semiconductor

11.3.2.6

SCI Control Register 2 (SCICR2)

Read: Anytime

Write: Anytime

76543210

TIE

TCIE

RIE

ILIE

RWU

SBK

Reset

00000000

Figure 11-9. SCI Control Register 2 (SCICR2)

Table 11-9. SCICR2 Field Descriptions

Field

Description

TIE

Transmitter Interrupt Enable Bit — TIE enables the transmit data register empty ﬂag, TDRE, to generate

interrupt requests.

0 TDRE interrupt requests disabled

1 TDRE interrupt requests enabled

TCIE

Transmission Complete Interrupt Enable Bit — TCIE enables the transmission complete ﬂag, TC, to generate

interrupt requests.

0 TC interrupt requests disabled

1 TC interrupt requests enabled

RIE

Receiver Full Interrupt Enable Bit — RIE enables the receive data register full ﬂag, RDRF, or the overrun ﬂag,

OR, to generate interrupt requests.

0 RDRF and OR interrupt requests disabled

1 RDRF and OR interrupt requests enabled

ILIE

Idle Line Interrupt Enable Bit — ILIE enables the idle line ﬂag, IDLE, to generate interrupt requests.

0 IDLE interrupt requests disabled

1 IDLE interrupt requests enabled

Transmitter Enable Bit — TE enables the SCI transmitter and conﬁgures the TXD pin as being controlled by

the SCI. The TE bit can be used to queue an idle preamble.

0 Transmitter disabled

1 Transmitter enabled

Receiver Enable Bit — RE enables the SCI receiver.

0 Receiver disabled

1 Receiver enabled

RWU

Receiver Wakeup Bit — Standby state

0 Normal operation.

1 RWU enables the wakeup function and inhibits further receiver interrupt requests. Normally, hardware wakes

the receiver by automatically clearing RWU.

SBK

Send Break Bit — Toggling SBK sends one break character (10 or 11 logic 0s, respectively 13 or 14 logics 0s

if BRK13 is set). Toggling implies clearing the SBK bit before the break character has ﬁnished transmitting. As

long as SBK is set, the transmitter continues to send complete break characters (10 or 11 bits, respectively 13

or 14 bits).

0 No break characters

1 Transmit break characters

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