mc68hc908qz16 Freescale Semiconductor, Inc, mc68hc908qz16 Datasheet - Page 193
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mc68hc908qz16
Manufacturer Part Number
mc68hc908qz16
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908QZ16.pdf
(314 pages)
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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 15-9
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.
For an 8-bit character, data sampling of the stop bit takes the receiver9 bit times × 16 RT cycles +
10 RT cycles = 154 RT cycles.
With the misaligned character shown in
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
the count of the transmitting device is 11 bit times × 16 RT cycles = 176 RT cycles.
The maximum percent difference between the receiver count and the transmitter count of a fast 9-bit
character with no errors is:
15.4.3.6 Receiver Wakeup
So that the MCU can ignore transmissions intended only for other receivers in multiple-receiver systems,
the receiver can be put into a standby state. Setting the receiver wakeup bit, RWU, in SCC2 puts the
receiver into a standby state during which receiver interrupts are disabled.
Freescale Semiconductor
shows how much a fast received character can be misaligned without causing a noise error
RECEIVER
RT CLOCK
MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 4
Figure
Figure
154 160
------------------------- -
170 176
------------------------- -
170 163
------------------------- -
Figure 15-9. Fast Data
154
170
170
STOP
–
–
–
15-9, the receiver counts 154 RT cycles at the point when
15-9, the receiver counts 170 RT cycles at the point when
×
×
×
100
100
100
SAMPLES
=
=
=
DATA
3.90%.
3.53%.
4.12%
IDLE OR NEXT CHARACTER
Functional Description
193
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