SC312XDP512F0MPVR datasheet(495/1348 Pages) FREESCALE

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Chapter 11 Serial Communication Interface (S12SCIV5)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

495

11.4.3

Data Format

The SCI uses the standard NRZ mark/space data format. When Infrared is enabled, the SCI uses RZI data

format where zeroes are represented by light pulses and ones remain low. See Figure 11-15 below.

Figure 11-15. SCI Data Formats

Each data character is contained in a frame that includes a start bit, eight or nine data bits, and a stop bit.

Clearing the M bit in SCI control register 1 conﬁgures the SCI for 8-bit data characters. A frame with eight

data bits has a total of 10 bits. Setting the M bit conﬁgures the SCI for nine-bit data characters. A frame

with nine data bits has a total of 11 bits.

When the SCI is conﬁgured for 9-bit data characters, the ninth data bit is the T8 bit in SCI data register

high (SCIDRH). It remains unchanged after transmission and can be used repeatedly without rewriting it.

A frame with nine data bits has a total of 11 bits.

Table 11-13. Example of 8-Bit Data Formats

Start

Bit

Data

Bits

Address

Bits

Parity

Bits

Stop

Bit

8001

7011

1 The address bit identiﬁes the frame as an address

character. See Section 11.4.6.6, “Receiver Wakeup”.

Table 11-14. Example of 9-Bit Data Formats

Start

Bit

Data

Bits

Address

Bits

Parity

Bits

Stop

Bit

9001

8011

Bit 5

Start

Bit

Bit 0

Bit 1

STOP

Bit

Start

Bit

8-Bit Data Format

(Bit M in SCICR1 Clear)

Start

Bit

Bit 0

STOP

Bit

START

Bit

9-Bit Data Format

(Bit M in SCICR1 Set)

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

Bit 8

Bit 2

Bit 3

Bit 4

Bit 6

Bit 7

POSSIBLE

PARITY

Bit

Possible

Parity

Bit

Standard

SCI Data

Infrared

SCI Data

Standard

SCI Data

Infrared

SCI Data

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