Data Sheet

BMD-380 - Data sheet
UBX-19039467 - R06 Electrical specifications Page 16 of 36
 Internal pull-up and pull-down resistors
 Wake-up from high- or low-level triggers on all pins
 Trigger interrupt on all pins
 All pins can be used by the PPI task/event system; the maximum number of pins that can be
interfaced through the PPI simultaneously is limited by the number of GPIOTE channels
 All pins can be individually configured to carry serial interface or quadrature demodulator signals
 Pins P1.01, P1.04, P1.05, and P1.07 are not available on the BMD-380
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
IH
Input High Voltage
0.7 x VCC
-
VCC
V
V
IL
Input Low Voltage
VSS
-
0.3 x VCC
V
V
OH
Output High Voltage
VCC − 0.4
-
VCC
V
V
OL
Output Low Voltage
VSS
-
VSS + 0.4
V
R
PU
Pull-up Resistance
11
13
16
kΩ
R
PD
Pull-down Resistance
11
13
16
kΩ
Table 8: GPIO electrical specifications
3.5 Module reset
GPIO pin P0.18 may be used for a hardware reset. In order to utilize P0.18 as a hardware reset, the
UICR registers PSELRESET[0] and PSELRESET[1] must be set alike, to the value of 0x7FFFFFD2.
When P0.18 is programmed as RESET, the internal pull-up is automatically enabled. Nordic
Semiconductor example applications and development kits program P0.18 as RESET_N.
3.6 Debug and programming
The BMD-380 series supports the two pin Serial Wire Debug (SWD) interface and offers flexible and
powerful mechanism for non-intrusive debugging of program code. Breakpoints, single stepping, and
instruction trace capture of code execution flow are part of this support.
The BMD-380 also supports ETM and ITM trace. The trace data from the ETM and the ITM is sent to
an external debugger via a 4-bit wide parallel trace port. In addition to parallel trace, the TPIU supports
serial trace via the Serial Wire Output (SWO) trace protocol.
3.7 Clocks
The BMD-380 requires two clocks, a high frequency clock and a low frequency clock.
The high frequency clock is provided on-module by a high-accuracy 32 MHz crystal as required by the
nRF528340 for radio operation.
The low frequency clock can be provided internally by an RC oscillator or synthesized from the fast
clock, or externally by a 32.768 kHz crystal. An external crystal provides the lowest power
consumption and greatest accuracy. Using the internal RC oscillator with calibration provides
acceptable performance for Bluetooth low energy applications at a reduced cost and slight increase
in power consumption.