SWRS152N June 2013 – April 2021 WL1801MOD , WL1805MOD , WL1831MOD , WL1835MOD
PRODUCTION DATA
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The interface includes four signals:
Flow control between the host and the device is byte-wise by hardware.
When the UART RX buffer of the device passes the flow-control threshold, the buffer sets the UART_RTS signal high to stop transmission from the host. When the UART_CTS signal is set high, the device stops transmitting on the interface. If HCI_CTS is set high in the middle of transmitting a byte, the device finishes transmitting the byte and stops the transmission.
Figure 8-10 shows the UART timing.
Table 8-5 lists the UART timing characteristics.
PARAMETER | CONDITION | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
Baud rate | 37.5 | 4364 | Kbps | |||
Baud rate accuracy per byte | Receive-transmit | –2.5% | 1.5% | |||
Baud rate accuracy per bit | Receive-transmit | –12.5% | 12.5% | |||
t3 | CTS low to TX_DATA on | 0.0 | 2.0 | µs | ||
t4 | CTS high to TX_DATA off | Hardware flow control | 1.0 | bytes | ||
t6 | CTS high pulse duration | 1.0 | Bit | |||
t1 | RTS low to RX_DATA on | 0.0 | 2.0 | µs | ||
t2 | RTS high to RX_DATA off | Interrupt set to 1/4 FIFO | 16.0 | bytes |
Figure 8-11 shows the UART data frame.