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SC312XDP512F0MPVR датащи(PDF) 502 Page - Freescale Semiconductor, Inc

номер детали SC312XDP512F0MPVR
подробное описание детали  HCS12X Microcontrollers
PDF  1348 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

SC312XDP512F0MPVR датащи(HTML) 502 Page - Freescale Semiconductor, Inc

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Chapter 11 Serial Communication Interface (S12SCIV5)
MC9S12XDP512 Data Sheet, Rev. 2.21
502
Freescale Semiconductor
11.4.6
Receiver
Figure 11-20. SCI Receiver Block Diagram
11.4.6.1
Receiver Character Length
The SCI receiver can accommodate either 8-bit or 9-bit data characters. The state of the M bit in SCI
control register 1 (SCICR1) determines the length of data characters. When receiving 9-bit data, bit R8 in
SCI data register high (SCIDRH) is the ninth bit (bit 8).
11.4.6.2
Character Reception
During an SCI reception, the receive shift register shifts a frame in from the RXD pin. The SCI data register
is the read-only buffer between the internal data bus and the receive shift register.
After a complete frame shifts into the receive shift register, the data portion of the frame transfers to the
SCI data register. The receive data register full flag, RDRF, in SCI status register 1 (SCISR1) becomes set,
M
WAKE
ILT
PE
PT
RE
H
876543210L
11-Bit Receive Shift Register
Data
Wakeup
Parity
Checking
SCI Data Register
R8
ILIE
RWU
RDRF
OR
NF
FE
PE
Internal Bus
Bus
SBR12:SBR0
Baud Divider
Clock
IDLE
RAF
Recovery
Logic
RXPOL
LOOPS
Loop
RSRC
Control
SCRXD
From TXD Pin
or Transmitter
Idle IRQ
RDRF/OR
IRQ
Break
Detect Logic
Active Edge
Detect Logic
BRKDFE
BRKDIE
BRKDIF
RXEDGIE
RXEDGIF
Break IRQ
RX Active Edge IRQ
RIE



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