MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
21-21
21.4.4
Transmitter
illustrates the features of the eSCI transmitter.
Figure 21-13. eSCI Transmitter Block Diagram
Table 21-17. Baud Rates (Example: System Clock = 128 Mhz)
Bits
SBR[0:12]
Receiver
Clock (Hz)
Transmitter
Clock (Hz)
Target Baud
Rate
Error
(%)
0x0023
3,657,143
228,571
230,400
–0.79
0x0045
1,855,072
115,942
115,200
+0.64
0x008B
920,863
57,554
57,600
–0.01
0x00D0
615,385
38,462
38,400
+0.16
0x01A1
306,954
19,185
19,200
–0.08
0x022C
230,216
14,388
14,400
–0.08
0x0341
153,661
9,604
9600
+.04
0x0683
76,785
4,799
4800
–0.02
0x0D05
38,404
2,400.2
2400
+.01
0x1A0A
19,202
1,200.1
1200
+.01
SCI baud rate
System clock
16
ESCIx_CR1[SBR]
-------------------------------------------------------------
=
M
TXD
÷16
H 8
7
6
5
4
3
2
1
0
L
11-bit Transmit Shift Register
STOP
START
MSB
BAUD Divider
Bus
Clock
SBR0–SBR12
SBK
Parity
Generation
PE
PT
Load from
ESCIx_DR
Shift
Enable
Preamble
(All 1s)
Break
(All 0s)
Transmitter Control
T8
TE
TIE
TDRE
LOOP Control
TDRE
Interrupt
Request
TCIE
TC
TC
Interrupt
Request
RSRC
LOOPS
To
Internal Bus
eSCI Data Registers
RXD
Summary of Contents for MPC5553
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