SX1441EVK Semtech, SX1441EVK Datasheet - Page 35

• Manufacturer Part Number: SX1441EVK
• Description: KIT DEV FOR SX1441
• Manufacturer: Semtech
• Series: EasyBlue™r
• Type: Bluetoothr

Specifications of SX1441EVK

• For Use With/related Products: SX1441
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Contents: -
• Other names: SX1441DVK; SX1441DVK

Personal Area Network
3.8.9 Reset Sources
The PA port can be configured to generate a system reset when a predetermined word is detected on PA[7:0]. The
reset is built using a logical AND of the 8 PAReset[i] signals:
resetfromportA = PAReset[7] AND PAReset[6] AND PAReset[5] AND ... AND PAReset[0]
PAReset[i] is itself a logical function of the corresponding pin PA[i]. One of four logical functions can be selected
for each pin by writing into two registers RegPARes0 and RegPARes1 as shown in Table 51.
A reset from port PA can be inhibited by placing a 0 on both PARes1[i] and PARes0[i] for at least 1 pin. Setting
both RegPARes1[i] and RegPARes0[i] to 1, makes the reset independent of the value on the corresponding pin.
Setting both registers to 0xff, will reset the circuit independently of the PA input value. This makes it possible to
generate a software reset. Depending on the value of PA[0] to PA[7], the change of RegPARes0 and RegPARes1
can cause a reset. Therefore it is safe to always have one (RegPARes0[i], RegPARes1[i]) equal to 0x00 during
the setting operations.
3.9
3.9.1 Features
3.9.2 Register map
© Semtech 2006
PARes1[i]
0
0
1
1
Name
RegPBOut
RegPBIn
RegPBDir
RegPBOpen
RegPBPullup
Pos
7:0
Pos
7:0
•
•
•
•
•
•
•
•
DIGITAL INPUT/OUTPUT PORT PB[7:0]
8-bit wide input/output port
Each bit can be configured as input or output
Each bit can be configured as open-drain or push-pull
A pull-up can be enabled on each bit
In open-drain mode, the pull-up is not active when corresponding pad is set to zero
Two internal freq. (ck32kHz and CkCpu) can be output on PB[2] and PB[3]
Two PWM signals can be driven on pads PB[0] and PB[1]
The UART interface uses PB[7:4] for UA_RX, UA_TX, UA_RTS and UA_CTS respectively
RegPBout
PBOut
RegPBIn
PBIn
r/w
rw
r/w
r
PARes0[x]
0
1
0
1
Table 51 - PAReset generation
Reset
00000000
Reset
xxxxxxxx
Table 53 - RegPBOut register
Table 54 - RegPBIn register
Table 52 - port PB registers
35
Function
port output value
Function
input value, read from pads PB[7:0]
Address (Hex)
0x0028
0x0029
0x002A
0x002B
0x002C
PAReset[i]
0
PA[i]
not PA[i]
1
SX1441 – Bluetooth® 1.2 SoC
www.semtech.com
Data Sheet