MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 442

• Manufacturer Part Number: MC68000
• Manufacturer: MOTOROLA [Motorola, Inc]

SCC Programming Reference
EXTC—External Clock Source
TCS—Transmit Clock Source
RCS—Receive Clock Source
CD10-CD0—Clock Divide
DIV4—SCC Clock Prescaler Divide by 4
E.2.1.2.2 SCC Mode Register (SCM). This 16-bit register is located at offset $884 (SCC1),
$894 (SCC2), and $8A4 (SCC3). The SCM register configures the operation of the SCC and
defines UART specific parameters.
TPM1,TMP0—Transmitter Parity Mode
RPM—Receiver Parity Mode
PEN—Parity Enable
E-20
Used to preset the 11-bit counter that is decremented at the prescaler output rate.
RSTM
TPM1
0 = The internal main clock is the source for the baud rate generator.
1 = The external clock on the TIN1 pin is the source for the baud rate generator.
0 = Transmit clock source is the baud rate generator output.
1 = Transmit clock source is the clock signal on TCLK pin.
0 = Receive clock source is the baud rate generator output.
1 = Receive clock source is the clock signal on TCLK pin.
0 = Divide-by-1 prescaler.
1 = Divide-by-4 prescaler.
00 = Odd parity; always send an odd number of ones.
01 = Force low parity; always send a zero in the parity bit position.
10 = Even parity; always send an even number of ones.
11 = Force high parity; always send a one in the parity bit position.
0 = Odd parity.
1 = Even parity.
0 = No parity.
1 = Parity is enabled for the transmitter and receiver.
15
7
TPM0
14
SL
6
DIAG1
RPM
13
5
MC68360 USER’S MANUAL
DIAG0
PEN
12
4
UM1
ENR
11
3
UM0
ENT
10
2
MODE1
FRZ
9
1
MOTOROLA
MODE0
CL
8
0