CC2564_15 Datasheet, PDF (35/47 Pages) Texas Instruments – Bluetooth® and Dual-Mode Controller

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HCI_RTS
t1
HCI_RX
HCI_CTS
t3
HCI_TX
CC256x
SWRS121D – JULY 2012 – REVISED JANUARY 2014
t2
t6
t4
Start bit
Stop bit
10 bits
Figure 4-1. UART Timing
td_uart_swrs064
Table 4-1. UART Timing Characteristics
Symbol
Characteristics
Baud rate
Baud rate accuracy per byte
Baud rate accuracy per bit
t3 CTS low to TX_DATA on
t4 CTS high to TX_DATA off
t6 CTS-high pulse width
t1 RTS low to RX_DATA on
t2 RTS high to RX_DATA off
Condition
Receive and transmit
Receive and transmit
Hardware flow control
Interrupt set to 1/4 FIFO
Min
Typ
Max Unit
37.5
4000 kbps
–2.5
1.5
%
–12.5
12.5
%
0
2
μs
1
byte
1
bit
0
2
μs
16
byte
Figure 4-2 shows the UART data frame. Table 4-2 describes the symbols used in Figure 4-2.
tb
TX
STR
D0
D1
D2
Dn
PAR STP
td_uart_swrs064
Figure 4-2. Data Frame
Table 4-2. Data Frame Key
Symbol
STR
D0...Dn
PAR
STP
Description
Start bit
Data bits (LSB first)
Parity bit (optional)
Stop bit
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Device Specifications
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