HC05 datasheet(110/232 Pages) MOTOROLA

110 / 232 page

MOTOROLA

7-8

MC68HC05X16

Rev. 1

SERIAL COMMUNICATIONS INTERFACE

If the receiver detects that a break (RDRF = 1, FE = 1, receiver data register = $0000) produced

the framing error, the start bit will not be artiﬁcially induced and the receiver must actually detect

a logic one before the start bit can be recognised (see Figure 7-7).

7.9

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 Section 7.5 and shown in Figure 7-3. 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 (assuming the same baud rate is selected for both the

receiver and transmitter).

Figure 7-6 Artiﬁcial start following a framing error

Figure 7-7 SCI start bit following a break

Data

Expected stop

Data samples

Artiﬁcial edge

Start bit

Data

RDI

Data

Expected stop

Data samples

Start edge

Start bit

Data

RDI

a) Case 1: receive line low during artiﬁcial edge

b) Case 2: receive line high during expected start edge

Expected stop

Data samples

Detected as valid start edge

Start bit

RDI

Break

Start

qualiﬁers

Start edge

veriﬁcation

samples

108

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