MC908AP16CFAE Datasheet, PDF (156/324 Pages) Freescale Semiconductor, Inc – Table of Contents

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