MC68HC901P MOTOROLA [Motorola, Inc], MC68HC901P Datasheet - Page 46

• Manufacturer Part Number: MC68HC901P
• Description: Multi-Function Peripheral
• Manufacturer: MOTOROLA [Motorola, Inc]

7.1.3 USART Control Register (UCR)
This register selects the clock mode and the character format for the receive and transmit
sections.
CLK — Clock Mode
CL1-CL0 — Character Length
These bits specify the length of the character exclusive of start bits and parity.
ST1-ST0 — Start/Stop Bit and Format Control
These bits select the number of start and stop bits and specify the character format.
MOTOROLA
UCR REGISTER
RESET
FIELD
ADDR
BIT
1 = Data clocked into and out of receiver and transmitter at one sixteenth the frequency
0 = Data clocked into and out of receiver and transmitter at the frequency of their
NOTE: Used with divide-by-16 mode only.
ST1
of their respective clocks.
respective clocks.
0
0
1
1
CLK
7
0
CL1
0
0
1
1
ST0
0
1
0
1
CL1
6
0
CL0
START BITS
0
1
0
1
MC68HC901 USER’S MANUAL
CL0
5
0
0
1
1
1
Universal Synchronous/Asynchronous Receiver-Transmitter
ST1
4
0
STOP BITS
CHARACTER LENGTH
$29
1-1/2
0
1
2
ST0
8 Bits
7 Bits
6 Bits
5 Bits
3
0
Asynchronous (See note)
PE
2
0
Asynchronous
Asynchronous
Synchronous
FORMAT
E / O
1
0
U
0
0
7-3