mc908jl16 Freescale Semiconductor, Inc, mc908jl16 Datasheet - Page 95

• Manufacturer Part Number: mc908jl16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Fast Data Tolerance
Figure 7-8
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 receiver
9 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
7.4.3.6 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.
Depending on the state of the WAKE bit in SCC1, either of two conditions on the RxD pin can bring the
receiver out of the standby state:
Freescale Semiconductor
shows how much a fast received character can be misaligned without causing a noise error or
RECEIVER
RT CLOCK
MC68HC908JL16 Data Sheet, Rev. 1.1
154 160
------------------------- -
170 176
------------------------- -
Figure
Figure
Figure 7-8. Fast Data
154
170
STOP
–
–
7-8, the receiver counts 154 RT cycles at the point when
7-8, the receiver counts 170 RT cycles at the point when
×
×
100
100
SAMPLES
=
=
DATA
3.90%
3.53%
·
IDLE OR NEXT CHARACTER
Functional Description
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