Enhanced Serial Communication Interface (eSCI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
20-26
Freescale Semiconductor
20.4.5
Receiver
illustrates the eSCI receiver.
Figure 20-16. eSCI Receiver Block Diagram
20.4.5.1
Receiver Character Length
The eSCI receiver accepts 8-bit or 9-bit data characters. The state of the M bit in eSCI control register 1
(ESCI
x
_CR1) determines the bit-length of data characters. When receiving 9-bit data, bit R8 in the eSCI
data register (ESCI
x
_DR) is the ninth bit (bit 8).
20.4.5.2
Character Reception
During an eSCI reception, the receive shift register shifts a frame in from the RXD input
signal. The eSCI
data register is the buffer (read-only during receive) 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
eSCI data register. The receive data register full flag, RDRF, in eSCI status register (ESCI
x
_SR) is then
set, indicating that the received byte can be read. If the receive interrupt enable bit, RIE, in eSCI control
register 1 (ESCI
x
_CR1) is also set, the RDRF flag generates an RDRF interrupt request.
RXD
H 8
7
6
5
4
3
2
1
0
L
11-bit Receive shift register
STOP
START
MSB
BAUD divider
Bus
Clock
SBR0–SBR12
ILIE
IDLE
LOOP control
IDLE
interrupt
request
RIE
RDRF/OR
interrupt
request
RSRC
LOOPS
TXD
Internal Bus
SCI data registers
Data recovery
RAF
RE
WAKE
M
ILT
Wake-up
logic
All 1s
Parity
checking
PE
PT
NF
FE
PE
RDRF
OR
R8
RWU
Summary of Contents for MPC5565
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Page 973: ...Preface MPC5565 Microcontroller Reference Manual Rev 1 0 21 36 Freescale Semiconductor...
Page 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...