User Manual

User’s Manual 17 Revision 1.3, 2013-08-14
Hardware Description
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PAN1322-SPP
ENW89841A3KF
PAN1322-SPP Interfaces
3.1.1.2 Detailed UART Behavior
After reset the UART interface is configured with one start bit, eight data bits, no parity bit and one stop bit. The
least significant bit is transmitted first.
The polarity of the UART signals can be changed with the BD_DATA parameter UART_Invert. The default (non-
nverted) behavior is shown in
Table 4.
0 Start bit, ’0’ bit in character.
Idle level, stop bit
0 Flow on
Flow stopped
3.1.1.3 UARTCTS Response Time
Figure 5 shows the UARTCTS response time. Assuming non-inverted UART signals, the data flow stops within
the “flow off response time” after UARTCTS has been set to high. If UARTCTS goes high during the transmission
of a byte (phase 1 in the figure) this byte will be completely transmitted. While UARTCTS is high, no data will be
transmitted (phase 2). When UARTCTS goes low again, data transmission will continue (phase 3).
The maximum flow off response time is 10 UART bits (including start and stop bits). As an example, if the UART
baud rate is 115200 Baud, the maximum flow off response time is 10 x 1/115200 s = 87 µs.
HCI_UARTCTS_Response_Time.vsd
UARTCTS
UARTTXD
bi t 0 bi t 1 bi t 2 bi t 3 bi t 4 bi t 5 bi t 6 bi t 7
st ar t
st op
bi t 0
st ar t
...
phase 1
phase 2
phase 3
flow off
response
time
max. flow off response
time
Figure 5 UARTCTS Response Time
3.2 Low Power Control
Pin P0.14 and P0.0 are optional, but strongly recommended to be used. P0.14 is used to allow PAN1322-SPP to
enter Low Power Mode (LPM). P0.0 is used by PAN1322-SPP when in LPM to wake up the host.
1843200 1857142 0.76
3250000 3250000 0
Table 3 Default (non-inverted) behavior of UART signals
Signal Level Meaning
UARTTXD / UARTRXD
1
UARTRTS / UARTCTS
1
Table 2 UART Baud Rates (cont’d)
Wanted Baud Rate Real Baud Rate Deviation Error (%)