MC68HC908AP16CFB datasheet(227/440 Pages) MOTOROLA

227 / 440 page

Serial Communications Interface Module (SCI)

Functional Description

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

227

The maximum percent difference between the receiver count and the

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

Fast Data Tolerance

Figure 13-8 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 13-8. Fast Data

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

9 bit times

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

With the misaligned character shown in Figure 13-8, 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

For a 9-bit character, data sampling of the stop bit takes the receiver

10 bit times

× 16 RT cycles + 10 RT cycles = 170 RT cycles.

With the misaligned character shown in Figure 13-8, the receiver counts

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

11 bit times

× 16 RT cycles = 176 RT cycles.

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.

For More Information On This Product,

Go to: www.freescale.com

MC68HC908AP16CFB Datasheet(PDF) 227 Page - Motorola, Inc

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