MC68HC08AZ16 Datasheet, PDF (181/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Serial Communications Interface Module (SCI)
Table 3. SCI receiver I/O register summary
Register name
Bit 7 6
5
4
3
2
1 Bit 0 Addr.
SCIcontrolregister1(SCC1) LOOPS ENSCI TXINV M WAKE ILTY PEN PTY $0013
SCIcontrolregister2(SCC2) SCTIE TCIE SCRIE ILIE TE RE RWU SBK $0014
SCIcontrolregister3(SCC3) R8 T8 DMARE DMATE ORIE NEIE FEIE PEIE $0015
SCIstatusregister1(SCS1) SCTE TC SCRF IDLE OR NF FE PE $0016
SCI status register 2 (SCS2)
BKF RPF $0017
SCI data register (SCDR)
$0018
SCI baud rate register (SCBR)
SCP1 SCP0
SCR2 SCR1 SCR0 $0019
= Unimplemented
• After every start bit
• After the receiver detects a data bit change from ’1’ to ’0’ (after the
majority of data bit samples at RT8, RT9, and RT10 returns a valid
’1’ and the majority of the next RT8, RT9, and RT10 samples
returns a valid ’0’).
PTE1/RxD
START BIT
LSB
SAMPLES
RT
CLOCK
RT CLOCK
STATE
RT CLOCK
RESET
START BIT
QUALIFICATION
START BIT
DATA
VERIFICATION SAMPLING
Figure 4. Receiver data sampling
MC68HC08AZ32
180
Serial Communications Interface Module (SCI)
12-sci
MOTOROLA