mc68hc705c9a Freescale Semiconductor, Inc, mc68hc705c9a Datasheet - Page 60

• Manufacturer Part Number: mc68hc705c9a
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface (SCI)
9.4 SCI Transmitter Features
Features of the SCI transmitter include:
60
•
•
•
TDO
PIN
Transmit data register empty flag
Transmit complete flag
Send break
$0011
The serial communications data register (SCI SCDR) is controlled by the
internal R/W signal. It is the transmit data register when written to and the
receive data register when read.
DATA SHIFT
REGISTER
REGISTER
TRANSMIT
TRANSMIT
Figure 9-1. Serial Communications Interface Block Diagram
DATA
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
TRANSMITTER
TE
TRDE
INTERNAL BUS
CONTROL
R8
7
7
SBK
TC
T8
6
6
&
RDRF
5
5
+
CONTROL
&
FLAG
IDLE
M
4
4
+
7
SCI INTERRUPT
NOTE
WAKE
OR
&
3
3
NF
2
2
RECEIVER
CONTROL
&
FE
SCSR
$0010
1
1
RECEIVER
CLOCK
0
SCCR1
$000E
SCCR2
$000F
WAKEUP
RWU
TCIE
SBK
RIE
ILIE
TIE
TE
RE
UNIT
$0011
7
6
5
4
3
2
1
0
DATA SHIFT
REGISTER
REGISTER
RECEIVE
RECEIVE
Freescale Semiconductor
DATA
RDI
PIN