Pin Configuration for BTA
MOTOROLA
Bluetooth Accelerator (BTA)
16-19
defines the amount of time that the oscillator needs to stabilize after having been turned on
by the deassertion of BTRFOSC. When the counter reaches the WAKEUP_4 value, the
BT1ClkHold signal is de asserted and the Bluetooth master clock is started.
Figure 16-10 shows the timing of the wake-up signals.
Figure 16-10. Timing of the Wake-Up Signals
After resuming from a power down the total BT power-down time is determined from the difference
between the values in the WAKEUP_4 and WAKEUP_1 Registers.
The current value of the power-down counter can be read at any time from the WU_COUNT register.
An interrupt is generated at the end of the BT1ClkHold interval (on a WU4 event). In the interrupt, the
PDE bit is cleared, and the external wake-up signal source is removed.
16.4 Pin Configuration for BTA
There are 15 pins used for the BTA module. Of these, 13 pins are multiplexed with other functions on the
device, and must be configured for BTA operation.
NOTE:
The user must ensure that the data direction bits in the GPIO are set to the
correct direction for proper operation. See Section 32.5.1, “Data Direction
Registers,” on page 32-9 for details.
PD E
WU 1
WU 2
WU 4
BT1C lkH old
BTR FOSC
BTwui
Software w rites
to pow er dow n
an d clea rs co unter
WU 1
W U2
W U4
Software cl ears
po wer-d own e nab le,
cou nter and i nterrup t
WakeUp_1
Wak eUp_2
WWak eUp_delta4
About 1.2s
About 4m s
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