參數資料
型號： TMS320DM355_07
廠商： Texas Instruments, Inc.
英文描述： Digital Media System-on-Chip (DMSoC)
中文描述： 數字媒體系統(tǒng)芯片（DMSoC）
文件頁數： 129/158頁
文件大?。?/td> 1319K
代理商： TMS320DM355_07
www.ti.com
P
5.11
Universal Asynchronous Receiver/Transmitter (UART)
5.11.1 UART Electrical Data/Timing
TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463B–SEPTEMBER 2007–REVISED OCTOBER 2007
The DM355 contains 3 separate UART modules (1 with hardware flow control). These modules performs
serial-to-parallel conversion on data received from a peripheral device or modem, and parallel-to-serial
conversion on data received from the CPU. Each UART also includes a programmable baud rate
generator capable of dividing the 24MHz reference clock by divisors from 1 to 65,535 to produce a 16 x
clock driving the internal logic. The UART modules support the following features:
Frequency pre-scale values from 1 to 65,535 to generate appropriate baud rates
16-byte storage space for both the transmitter and receiver FIFOs
Unique interrupts, one for each UART
Unique EDMA events, both received and transmitted data for each UART
1, 4, 8, or 14 byte selectable receiver FIFO trigger level for autoflow control and DMA
Programmable auto-rts and auto-cts for autoflow control (supported on UART2)
Programmable serial data formats
–
5, 6, 7, or 8-bit characters
–
Even, odd, or no parity bit generation and detection
–
1, 1.5, or 2 stop bit generation
False start bit detection
Line break generation and detection
Internal diagnostic capabilities
–
Loopback controls for communications link fault isolation
–
Break, parity, overrun, and framing error simulation
Modem control functions: CTS, RTS (supported on UART2)
Table 5-26. Timing Requirements for UARTx Receive (see
Figure 5-35
)
DM355
MIN
0.99U
(1)
0.99U
(1)
NO.
UNIT
MAX
4
5
t
w(URXDB)
t
w(URXSB)
Pulse duration, receive data bit (RXDn)
Pulse duration, receive start bit
1.05U
(1)
1.05U
(1)
ns
ns
(1)
U = UART baud time = 1/programmed baud rate.
Table 5-27. Switching Characteristics Over Recommended Operating Conditions for UARTx Transmit
(see
Figure 5-35
)
DM355
NO.
PARAMETER
UNIT
MIN
MAX
UART0/1 Maximum programmable baud rate
UART2 Maximum programmable baud rate
Pulse duration, transmit data bit (TXDn)
Pulse duration, transmit start bit
1.5
1
f
(baud)
MHz
5
2
3
t
w(UTXDB)
t
w(UTXSB)
U - 2
(1)
U - 2
(1)
U + 2
(1)
U + 2
(1)
ns
ns
(1)
U = UART baud time = 1/programmed baud rate.
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DM355 Peripheral Information and Electrical Specifications
129
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