Datasheet

Serial Communications Interface Module (SCI)
MC68HC908GP32 Data Sheet, Rev. 10
134 Freescale Semiconductor
13.4.1 Data Format
The SCI uses the standard non-return-to-zero mark/space data format illustrated in Figure 13-3.
Figure 13-3. SCI Data Formats
Addr. Register Name Bit 7 654321Bit 0
$0013
SCI Control Register 1
(SCC1)
Read:
LOOPS ENSCI TXINV M WAKE ILTY PEN PTY
Write:
Reset:00000000
$0014
SCI Control Register 2
(SCC2)
Read:
SCTIE TCIE SCRIE ILIE TE RE RWU SBK
Write:
Reset:00000000
$0015
SCI Control Register 3
(SCC3)
Read: R8
T8 R R ORIE NEIE FEIE PEIE
Write:
Reset:UU000000
$0016
SCI Status Register 1
(SCS1)
Read: SCTE TC SCRF IDLE OR NF FE PE
Write:
Reset:11000000
$0017
SCI Status Register 2
(SCS2)
Read:
BKF RPF
Write:
Reset:00000000
$0018
SCI Data Register
(SCDR)
Read: R7 R6 R5 R4 R3 R2 R1 R0
Write: T7 T6 T5 T4 T3 T2 T1 T0
Reset: Unaffected by reset
$0019
SCI Baud Rate Register
(SCBR)
Read:
SCP1 SCP0 R SCR2 SCR1 SCR0
Write:
Reset:00000000
= Unimplemented R = Reserved U = Unaffected
Figure 13-2. SCI I/O Register Summary
BIT 5
START
BIT
BIT 0 BIT 1
NEXT
STOP
BIT
START
BIT
8-BIT DATA FORMAT
BIT M IN SCC1 CLEAR
START
BIT
BIT 0
NEXT
STOP
BIT
START
BIT
9-BIT DATA FORMAT
BIT M IN SCC1 SET
BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8
BIT 2 BIT 3 BIT 4 BIT 6 BIT 7
PARITY
BIT
PARITY
BIT