Enhanced Serial Communication Interface (eSCI)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
24-23
Preliminary
To adjust to different bus loads, the sample point at which the incoming bit is compared to the one which
was transmitted can be selected with the BESM13 bit (see
). If set, the comparison will be
performed at RT clock 13, otherwise at RT clock 9 (also see
Section 24.4.4.3, “Data Sampling
”).
Figure 24-15. Fast Bit Error Detection Timing Diagram
24.4.4
Receiver
illustrates the eSCI receiver.
Figure 24-16. eSCI Receiver Block Diagram
Clock
BESM13 = 0
BESM13 = 1
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
RT clock
count
TX output
shift reg
RX Input
shift reg
Compare
sample
points
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
Wakeup
Logic
All 1s
Parity
Checking
PE
PT
NF
FE
PE
RDRF
OR
R8
RWU