MC908AP32CFBE Datasheet, PDF (156/324 Pages) Freescale Semiconductor, Inc – The following revision history table summarizes changes contained in this document. For your convenience, the page number designators have been linked to the appropriate location.

Serial Communications Interface Module (SCI)
11.3 Pin Name Conventions
The generic names of the SCI I/O pins are:
• RxD (receive data)
• TxD (transmit data)
SCI I/O (input/output) lines are implemented by sharing parallel I/O port pins. The full name of an SCI
input or output reflects the name of the shared port pin. Table 11-1 shows the full names and the generic
names of the SCI I/O pins. The generic pin names appear in the text of this section.
Table 11-1. Pin Name Conventions
Generic Pin Names:
Full Pin Names:
RxD
PTB3/RxD
TxD
PTB2/TxD
NOTE
When the SCI is enabled, the TxD pin is an open-drain output and requires
a pullup resistor to be connected for proper SCI operation.
Addr.
Register Name
$0013
Read:
SCI Control Register 1
(SCC1)
Write:
Reset:
$0014
Read:
SCI Control Register 2
(SCC2)
Write:
Reset:
$0015
Read:
SCI Control Register 3
(SCC3)
Write:
Reset:
Read:
$0016 SCI Status Register 1 (SCS1) Write:
Reset:
Read:
$0017 SCI Status Register 2 (SCS2) Write:
Reset:
$0018
Read:
SCI Data Register
(SCDR)
Write:
Reset:
$0019
Read:
SCI Baud Rate Register
(SCBR)
Write:
Reset:
Bit 7
LOOPS
0
SCTIE
0
R8
U
SCTE
1
0
R7
T7
0
0
6
ENSCI
0
TCIE
0
T8
U
TC
1
5
TXINV
0
SCRIE
0
DMARE
0
SCRF
4
M
0
ILIE
0
DMATE
0
IDLE
0
0
3
WAKE
0
TE
0
ORIE
0
OR
0
0
0
R6
R5
T6
T5
0
SCP1
0
0
= Unimplemented
0
0
R4
R3
T4
T3
Unaffected by reset
SCP0
R
0
0
R = Reserved
2
1
ILTY
PEN
0
0
RE
RWU
0
0
NEIE
FEIE
0
0
NF
FE
0
0
BKF
0
0
R2
R1
T2
T1
SCR2
SCR1
0
0
U = Unaffected
Figure 11-1. SCI I/O Register Summary
Bit 0
PTY
0
SBK
0
PEIE
0
PE
0
RPF
0
R0
T0
SCR0
0
MC68HC908AP Family Data Sheet, Rev. 4
156
Freescale Semiconductor