mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 403

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

14.3.2.2
Read: Anytime, if AMAP = 0.
Write: Anytime, if AMAP = 0.
Freescale Semiconductor
Module Base + 0x0002
SCISWAI
LOOPS
Reset
WAKE
RSRC
Field
M
7
6
5
4
3
W
R
LOOPS
Loop Select Bit — LOOPS enables loop operation. In loop operation, the RXD pin is disconnected from the SCI
and the transmitter output is internally connected to the receiver input. Both the transmitter and the receiver must
be enabled to use the loop function.
0 Normal operation enabled
1 Loop operation enabled
The receiver input is determined by the RSRC bit.
SCI Stop in Wait Mode Bit — SCISWAI disables the SCI in wait mode.
0 SCI enabled in wait mode
1 SCI disabled in wait mode
Receiver Source Bit — When LOOPS = 1, the RSRC bit determines the source for the receiver shift register
input. See
0 Receiver input internally connected to transmitter output
1 Receiver input connected externally to transmitter
Data Format Mode Bit — MODE determines whether data characters are eight or nine bits long.
0 One start bit, eight data bits, one stop bit
1 One start bit, nine data bits, one stop bit
Wakeup Condition Bit — WAKE determines which condition wakes up the SCI: a logic 1 (address mark) in the
most significant bit position of a received data character or an idle condition on the RXD pin.
0 Idle line wakeup
1 Address mark wakeup
SCI Control Register 1 (SCICR1)
0
7
This register is only visible in the memory map if AMAP = 0 (reset
condition).
Table
SCISWAI
0
6
14-5.
TNP[1:0]
Figure 14-5. SCI Control Register 1 (SCICR1)
11
10
01
00
Table 14-3. IRSCI Transmit Pulse Width
S12XS Family Reference Manual, Rev. 1.10
Table 14-4. SCICR1 Field Descriptions
RSRC
0
5
NOTE
M
0
4
Narrow Pulse Width
Description
WAKE
1/32
1/16
3/16
1/4
0
3
Serial Communication Interface (S12SCIV5)
ILT
0
2
PE
0
1
PT
0
0
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