Telit Wireless Solutions BLUEMOD+S42/AI/ADC/LUA, Руководство пользователя

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S42
Hardware User Guide
1VV0301303 Rev. 11
Page 15 of 85 2021-05-06
Not Subject to NDA
The following table shows the pin states of S42 during reset active.
Pin Name State: S42
EXT-RES# Input with pull-up (1)
XL-IN Input floating (disconnected)
XL-OUT Input floating (disconnected)
UART-TXD Input floating (disconnected)
UART-RXD Input floating (disconnected)
UART-RTS# Input floating (disconnected) with pull-up resistor 470k
Ω
(2)
UART-CTS# Input floating (disconnected)
IUR-OUT# Input floating (disconnected)
IUR-IN# Input floating (disconnected)
GPIO[0:14] Input floating (disconnected)
TESTMODE# Input floating (disconnected)
BOOT0 Input floating (disconnected)
SWDIO Input with pull-up (1)
SWCLK Input with pull-down (1)
(1) pull-up, pull-down: R
PU,
R
PD
is typ. 13k Ω (11k Ω to 16k Ω )
(2)
a discrete resistor is used
Table 3: Pin States during Reset
The pin states as indicated in Table 3 are kept until hardware initialization has started.
3.3. Serial Interface
The serial interface of S42 is a high-speed UART interface supporting RTS/CTS
flow control and interface-up/down mechanism according to the UICP+ protocol (refer to
[5] ).
Electrical interfacing is at CMOS levels (defined by VSUP; see chapter 5.4.1).
Transmission speeds are 9600 – 921600 bps and 1Mbps (asynchronous).
Character representation: 8 Bit, no parity, 1 stop bit (8N1).
Hardware flow-control with RTS and CTS (active low).
Note/Tip: Transmission speed may be limited by firmware. See
corresponding AT command reference [3] for further information.
Note/Tip: Connecting Bluetooth module and host CPU via an UART
interface.