SPIRIT1 datasheet(70/94 Pages) STMICROELECTRONICS

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MCU interface

SPIRIT1

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Doc ID 022758 Rev 3

All interrupts are reported on a set of interrupt status registers and are individually

maskable. The interrupt status register must be cleared upon a read event from the MCU.

The status of all the interrupts is reported on the IRQ_STATUS[3:0] registers: bits are high

for the events that have generated any interrupts. The interrupts are individually maskable

using the IRQ_MASK[3:0] registers: if the mask bit related to a particular event is

programmed at 0, that event does not generate any interrupt request.

Digital inputs can be selected from the following (see GPIOx_CONF register):

The only available analog output is the temperature sensor, see Section 8.10.

10.4

MCU clock

SPIRIT1 can directly provide the system clock to the MCU in order to avoid the use of an

additional crystal. The clock signals for the MCU can be available on the GPIO pins. The

source oscillator can be the internal RCO or the XO depending on the active state. When

XO is active, it is the source clock (the RCO is not available in this condition).

In addition, different ratios are available and programmable through the MCU_CK_CONF

configuration register, as described in Table 35.

Device waiting for timer expiration before starting to sample the lock-detector

output signal

Device waiting for a high level of the READY2 signal from XO

Device waiting for timer expiration to allow PM block settling

Device waiting for end of VCO calibration

Device enables the full circuitry of the SYNTH block

Device waiting for a high level of the RCCAL_OK signal from the RCO

calibrator

Table 34.

Digital inputs

I/O selection

Input signal

1 >> TX command

1 >> RX command

TX data input for direct modulation

Wake-up from external input (sensor output)

External clock @ 34.7 kHz (used for LDC modes timing)

From 5 to 31

Not used

Table 33.

Digital outputs (continued)

I/O

selection

Output signal

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