MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
21-9
21.3.3.3
eSCI Data Register (ESCIx_DR)
NOTES
In 8-bit data format, only bits 8–15 of ESCI
x
_DR need to be accessed.
When transmitting in 9-bit data format and using 8-bit write instructions,
write first to ESCI
x
_DR[0–7], then ESCI
x
_DR[8–15]. For 9-bit
transmissions, a single write may also be used.
ESCI
x
_DR should not be used in LIN mode, writes to this register are
blocked in LIN mode.
Even if parity generation/checking is enabled via ESCIx_CR[PE], the parity
bit will not be masked out.
21.3.3.4
eSCI Status Register (ESCIx_SR)
The ESCI
x
_SR indicates the current status. The status flags can be polled, and some can also be used to
generate interrupts. All bits in ESCI
x
_SR except for RAF are cleared by writing 1 to them.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
R8
T8
0
0
0
0
0
0
R7
R6
R5
R4
R3
R2
R1
R0
W
T7
T6
T5
T4
T3
T2
T1
T0
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x0006
Figure 21-4. eSCI Data Register (ESCIx_DR)
Table 21-5. ESCIx_DR Field Description
Bits
Name
Description
0
R8
Received bit 8. R8 is the ninth data bit received when the eSCI is configured for 9-bit data
format (M = 1).
1
T8
Transmit bit 8. T8 is the ninth data bit transmitted when the eSCI is configured for 9-bit data
format (M = 1).
Note: If the value of T8 is the same as in the previous transmission, T8 does not have to
be rewritten.The same value is transmitted until T8 is rewritten.
2–7
—
Reserved.
8–15
R7–R0 /
T7–T0
Received bits/transmit bits 7–0 for 9-bit or 8-bit formats. Bits 7–0 from SCI communication
may be read from ESCIx_DR[8–15] (provided that SCI communication was successful).
Writing to ESCIx_DR [8–15] provides bits 7–0 for SCI transmission.
Summary of Contents for MPC5553
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