C8051F326-TB Silicon Laboratories Inc, C8051F326-TB Datasheet - Page 120

• Manufacturer Part Number: C8051F326-TB
• Description: BOARD PROTOTYPING W/C8051F326
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F326-TB

• Contents: Board
• Processor To Be Evaluated: C8051F326/F327
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F326
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

C8051F326/7
13.2. Data Format
UART0 has a number of available options for data formatting. Data transfers begin with a start bit (logic
low), followed by the data bits (sent LSB-first), a parity or extra bit (if selected), and end with one or two
stop bits (logic high). The data length is variable between 5 and 8 bits. A parity bit can be appended to the
data, and automatically generated and detected by hardware for even, odd, mark, or space parity. The stop
bit length is selectable between 1 and 2 bit times, and a multi-processor communication mode is available
for implementing networked UART buses. All of the data formatting options can be configured using the
SMOD0 register, shown in SFR Definition 13.2. Figure 13.2 shows the timing for a UART0 transaction
without parity or an extra bit enabled. Figure 13.3 shows the timing for a UART0 transaction with parity
enabled (PE0 = 1). Figure 13.4 is an example of a UART0 transaction when the extra bit is enabled
(XBE0 = 1). Note that the extra bit feature is not available when parity is enabled, and the second stop bit
is only an option for data lengths of 6, 7, or 8 bits.
120
SPACE
SPACE
MARK
MARK
BIT TIMES
BIT TIMES
SPACE
MARK
BIT TIMES
START
START
BIT
BIT
Figure 13.2. UART0 Timing Without Parity or Extra Bit
START
BIT
D
D
Figure 13.4. UART0 Timing With Extra Bit
0
0
Figure 13.3. UART0 Timing With Parity
D
0
D
D
1
1
N bits; N = 5, 6, 7, or 8
N bits; N = 5, 6, 7, or 8
D
1
N bits; N = 5, 6, 7, or 8
Rev. 1.1
D
D
N-2
N-2
D
N-2
D
D
N-1
N-1
D
N-1
PARITY
EXTRA
STOP
BIT 1
STOP
STOP
BIT 1
BIT 1
Optional
(6,7,8 bit
STOP
BIT 2
Data)
Optional
Optional
(6,7,8 bit
(6,7,8 bit
STOP
STOP
BIT 2
Data)
BIT 2
Data)