XC912BC32CFU8 Motorola Semiconductor Products, XC912BC32CFU8 Datasheet - Page 207

• Manufacturer Part Number: XC912BC32CFU8
• Description: M68HC12B Family Data Sheet
• Manufacturer: Motorola Semiconductor Products

14.2.3.2 SCI Control Register 1
M68HC12B Family — Rev. 8.0
MOTOROLA
NOTE:
Read: Anytime
Write: SBR12–SBR0 anytime; low-order byte must be written for change to take
SC0BDH and SC0BDL are considered together as a 16-bit baud rate control
register.
The value in SBR12–SBR0 determines the baud rate of the SCI. The desired baud
rate is determined by the following formula:
Which is equivalent to:
BR is the value written to bits SBR12–SBR0 to establish the baud rate.
The baud rate generator is disabled until the TE or RE bit in SC0CR2 register is set
for the first time after reset and/or the baud rate generator is disabled when
SBR12–SBR0 = 0.
BTST — Reserved for test function
BSPL — Reserved for test function
BRLD — Reserved for test function
Read: Anytime
Write: Anytime
LOOPS — SCI LOOP Mode/Single-Wire Mode Enable Bit
Address:
The receiver input is determined by the RSRC bit. The transmitter output is
controlled by the associated DDRS bit. Both the transmitter and the receiver
must be enabled to use the LOOP or the single-wire mode.
SCI baud rate
BR
0 = SCI transmit and receive sections operate normally.
1 = SCI receive section is disconnected from the RXD pin and the RXD pin
Reset:
Read:
Write:
effect — SBR15–SBR13 only in special modes
=
is available as general-purpose I/O.
$00C2
------------------------------------------------- -
16
LOOPS
Bit 7
×
0
Figure 14-5. SCI Control Register 1 (SC0CR1)
SCI baud rate
MCLK
=
WOMS
-------------------- -
16
MCLK
Serial Interface
6
0
×
BR
RSRC
5
0
M
4
0
Serial Communication Interface (SCI)
WAKE
3
0
ILT
2
0
Serial Interface
PE
1
0
Data Sheet
Bit 0
PT
0
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