MC68HC711KS2MFN4 Freescale Semiconductor, MC68HC711KS2MFN4 Datasheet - Page 157
MC68HC711KS2MFN4
Manufacturer Part Number
MC68HC711KS2MFN4
Description
32K EPROM - SLOW MODE
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68HC711KS2MFN4.pdf
(290 pages)
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7.7 Short Mode Idle Line Detection
7.8 Baud Rate Selection
M68HC11K Family
MOTOROLA
EXTAL
NOTE:
SCBDH/L SCI BAUD RATE
13-BIT COMPARE
13-BIT COUNTER
Figure 7-4. SCI Baud Generator Circuit Diagram
CONTROL
This feature can increase system communication speed by reducing the
amount of time between messages. Setting the ILT bit in SCCR1 allows
the SCI receiver to detect the consecutive 1s of an idle period before the
stop bit of an incoming character is received. If the last few bits of the
character are 1s, they are counted as the first high bits in the frame of 1s
comprising the idle period following the character.
Extra care may be needed to prevent premature detection of an idle line
condition.
The baud rate generator for the SCI includes a 13-bit modulus prescaler
driven by the system crystal clock (EXTAL). Writing to the SCI baud rate
register (SCBDH/L) selects the prescaler value. See
Serial Communications Interface (SCI)
RESET
2
INTERNAL
PHASE 2
CLOCK
SYNCH
Serial Communications Interface (SCI)
Short Mode Idle Line Detection
16
Figure
TRANSMITTER
Technical Data
BAUD RATE
BAUD RATE
RECEIVER
7-4.
CLOCK
CLOCK
157
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