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SR/AI
SR/AP
Hardware Reference
Release r09
Page 14 of 76
The following table shows the pin states of SR during reset active.
Pin Name
State: SR
EXT-RES#
I/O with pull-up
(1)
and 100n to GND
– use open drain
SLCK
Input with weak pull-down
(2)
UART-TXD
Input floating
UART-RXD
Input floating
UART-RTS#
Input with pull-up resistor 470k
Ω
(4)
UART-CTS#
Input floating
IUR-OUT#
Input with pull-up resistor 470k
Ω
(4)
IUR-IN#
Input floating
GPIO[0:4, 6:7]
Input floating
GPIO[5]
Input with pull-up
(1)
GPIO[8]
Output (JTDO)
BT-ACT
Input with weak pull-up
(2)
BT-STAT
Input with weak pull-up
(2)
WLAN-DNY
Input with weak pull-up
(2)
BT-PER
Input with weak pull-up
(2)
TESTMODE#
Input floating
BOOT0
Input with pull-down resistor 100k
Ω
(4)
SWDIO
Input with pull-up
(1)
SWCLK
Input with pull-down
(1)
(1)
pull-up, pull-down: R
PU,
R
PD
is typ. 40k
Ω (30kΩ to 50kΩ)
(2)
weak pull-up, pull-down: See Table 12: DC characteristics, digital IO (CSR8811 related)
(3)
strong pull-up, pull-down: See Table 12: DC characteristics, digital IO (CSR8811 related)
(4)
a discrete resistor is used
Table 2: Pin States during Reset
The pin states as indicated in Table 2 are kept until hardware initialization has started.
3.4 Supply Voltage Monitor
Supply-under-voltage detection is implemented using the STM32 embedded supply voltage
monitor PVD. When VSUP falls below a threshold V
PVD
(programmed to 2,38V ± 0,1V), a system
reset will be asserted.
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