TMS320DM8148_1109 Datasheet, PDF (346/360 Pages) Texas Instruments – TMS320DM814x DaVinci Digital Media Processors

TMS320DM8148, TMS320DM8147, TMS320DM8146
SPRS647B – MARCH 2011 – REVISED SEPTEMBER 2011
8.21.2 UART Electrical/Data Timing
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(see Figure 8-97)
Table 8-99. Timing Requirements for UART
NO.
4 t_w(RX)
Pulse width, receive data bit, 15/30/100pF high or low
5 t_w(CTS)
Pulse width, receive start bit, 15/30/100pF high or low
t_d(RTS-TX)
Delay time, transmit start bit to transmit data
t_d(CTS-TX)
Delay time, receive start bit to transmit data
(1) U = UART baud time = 1/programmed baud rate
(2) P = Clock period of the reference clock (FCLK, usually 48 MHz).
OPP100
MIN
0.96U ⁽¹⁾
0.96U ⁽¹⁾
P ⁽²⁾
P ⁽²⁾
MAX
1.05U ⁽¹⁾
1.05U ⁽¹⁾
UNIT
ns
ns
ns
ns
Table 8-100. Switching Characteristics Over Recommended Operating Conditions for UART
(see Figure 8-97)
NO.
PARAMETER
OPP100
UNIT
MIN
MAX
15 pF
(UART0/1/2)
5
f_(baud)
Maximum programmable baud rate
15 pF
(UART3/4/5)
12 _MHz
30 pF
0.23
2 t_w(TX)
3 t_w(RTS)
Pulse width, transmit data bit, 15/30/100 pF high or low
Pulse width, transmit start bit, 15/30/100 pF high or low
100 pF
0.115
U - 2 ⁽¹⁾
U + 2⁽¹⁾
ns
U - 2⁽¹⁾
U + 2⁽¹⁾
ns
(1) U = UART baud time = 1/programmed baud rate
UARTx_TXD
3
2
Start
Bit
Data Bits
UARTx_RXD
5
4
Start
Bit
Data Bits
Figure 8-97. UART Timing
346 Peripheral Information and Timings
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