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BLUENRG-2 Datasheet(PDF) 135 Page - STMicroelectronics

Part # BLUENRG-2
Description  Bluetooth® low energy wireless system-on-chip
PDF  190 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

BLUENRG-2 Datasheet(HTML) 135 Page - STMicroelectronics

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BlueNRG-2
Functional details
DocID030675 Rev 2
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Bit
Field name
Reset
RW
Description
6
TNCIEN
0x0
RW
Timer interrupt C enable:
0: Interrupt disabled.
1: Interrupt enabled
7
TNDIEN
0x0
RW
Timer interrupt D enable:
0: Interrupt disabled.
1: Interrupt enabled.
31:8
RESERVED
0x0
R
RESERVED
Table 168: MFTX - TNICLR register description: address offset MFTX_BASE_ADDR+0x20
Bit
Field name
Reset
RW
Description
0
TNACLR
0x0
W
1: clear the timer pending flag A
1
TNBCLR
0x0
W
1: clear the timer pending flag B.
2
TNCCLR
0x0
W
1: clear the timer pending flag C.
3
TNDCLR
0x0
W
1: clear the timer pending flag D.
31:4
RESERVED
0x0
R
RESERVED
3.14
Watchdog
3.14.1
Introduction
The watchdog timer provides a way of recovering from software crashes.
The watchdog monitors the interrupt and asserts a Reset signal if the interrupt remains
unserved for the entire programmed period.
The watchdog clock is used to generate a regular interrupt, depending on a programmed
value. It is counting down at a fixed frequency around 32.768 kHz provided either by
embedded RCO or by the external XO 32 kHz.
Main features are:
32-bit down counter at fixed frequency 32.768 kHz
Generate an interrupt each time the counter reaches zero
Generate an internal reset that reboot the system if the generated interrupt is not
cleared by software and a second interrupt occurs
3.14.2
Functional description
The watchdog timer is a 32-bit down counter that divides the clock input to produce an
interrupt. The divide ratio is fully programmable and controls the interrupt interval, which
can be calculated as:
Interrupt interval = (WDT_LOAD + 1) / (clock frequency in Hz).
The table below shows examples of WDT_LOAD values.
Table 169: Watchdog interrupt interval
WDT_LOAD
Interrupt interval (ms)
4294967295
131072000
65535
2000



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