MC68HC705C9ACFN datasheet(90/157 Pages) FREESCALE

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General Release Speciﬁcation

Transmit Data Out (TDO)

MC68HC705C9A — Rev. 2.0

Serial Communications Interface (SCI)

9.13 Transmit Data Out (TDO)

Transmit data is the serial data from the internal data bus that is applied

through the SCI to the output line. Data format is as discussed in 9.7

Data Format and shown in Figure 9-3. The transmitter generates a bit

time by using a derivative of the RT clock, thus producing a transmission

rate equal to 1/16th that of the receiver sample clock.

9.14 SCI I/O Registers

The following I/O registers control and monitor SCI operation:

•

SCI data register (SCDR)

•

SCI control register 1 (SCCR1)

•

SCI control register 2 (SCCR2)

•

SCI status register (SCSR)

9.14.1 SCI Data Register (SCDR)

The SCI data register, shown in Figure 9-8, is the buffer for characters

received and for characters transmitted.

9.14.2 SCI Control Register 1 (SCCR1)

The SCI control register 1, shown in Figure 9-9, has these functions:

•

Stores ninth SCI data bit received and ninth SCI data bit

transmitted

•

Controls SCI character length

•

Controls SCI wakeup method

$0011

Bit 7

6543

Bit 0

Read:

BIT7

BIT6

BIT55

BIT4

BIT3

BIT2

BIT1

BIT0

Write:

Reset:

Unaffected by Reset

Figure 9-8. SCI Data Register (SCDR)

Freescale Semiconductor, Inc.

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