MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 240
MC68HC908LJ12CPB
Manufacturer Part Number
MC68HC908LJ12CPB
Description
8-bit microcontroller units
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC68HC908LJ12CPB.pdf
(413 pages)
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13.7.3.2 Character Reception
13.7.3.3 Data Sampling
MC68HC908LJ12
Freescale Semiconductor
RT CLOCK
RT CLOCK
SAMPLES
SCI_RxD
CLOCK
RESET
STATE
RT
—
Rev. 2.1
Infrared Serial Communications Interface Module (IRSCI)
During an SCI reception, the receive shift register shifts characters in
from the RxD pin. The SCI data register (SCDR) is the read-only buffer
between the internal data bus and the receive shift register.
After a complete character shifts into the receive shift register, the data
portion of the character transfers to the SCDR. The SCI receiver full bit,
SCRF, in SCI status register 1 (SCS1) becomes set, indicating that the
received byte can be read. If the SCI receive interrupt enable bit, SCRIE,
in SCC2 is also set, the SCRF bit generates a receiver CPU interrupt
request.
The receiver samples the RxD pin at the RT clock rate. The RT clock is
an internal signal with a frequency 16 times the baud rate. To adjust for
baud rate mismatch, the RT clock is resynchronized at the following
times (see
•
•
Figure 13-9. Receiver Data Sampling
QUALIFICATION
START BIT
After every start bit
After the receiver detects a data bit change from logic 1 to logic 0
(after the majority of data bit samples at RT8, RT9, and RT10
returns a valid logic 1 and the majority of the next RT8, RT9, and
RT10 samples returns a valid logic 0)
Figure
13-9):
VERIFICATION
START BIT
Infrared Serial Communications Interface Module (IRSCI)
START BIT
SAMPLING
DATA
Technical Data
LSB
241
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