M68ICS08GR datasheet(247/408 Pages) FREESCALE

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Serial Communications Interface (SCI)

Functional Description

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Serial Communications Interface (SCI)

247

With the misaligned character shown in Figure 18-7, the receiver counts

170 RT cycles at the point when the count of the transmitting device is

10 bit times

× 16 RT cycles + 3 RT cycles = 163 RT cycles.

The maximum percent difference between the receiver count and the

transmitter count of a slow 9-bit character with no errors is

18.5.3.7 Fast Data Tolerance

Figure 18-8 shows how much a fast received character can be

misaligned without causing a noise error or a framing error. The fast stop

bit ends at RT10 instead of RT16 but is still there for the stop bit data

samples at RT8, RT9, and RT10.

Figure 18-8. Fast Data

For an 8-bit character, data sampling of the stop bit takes the receiver

9bit times

× 16 RT cycles + 10 RT cycles = 154 RT cycles.

With the misaligned character shown in Figure 18-8, the receiver counts

154 RT cycles at the point when the count of the transmitting device is

10 bit times

× 16 RT cycles = 160 RT cycles.

The maximum percent difference between the receiver count and the

transmitter count of a fast 8-bit character with no errors is

170

163

–

170

--------------------------

100

4.12%

IDLE OR NEXT CHARACTER

STOP

DATA

SAMPLES

RECEIVER

RT CLOCK

154

160

–

154

--------------------------

100

3.90%

Freescale Semiconductor, Inc.

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