SI4021-A1-FT【PDF 17/34 页】IC TX FSK 915MHZ 5.4V 16-TSSOP

Si4021

8. Push-Button Command

bit 15 14 13 12 11 10

POR

p4 d1 d0 b4 b3 b2 b1 bc

CA00h

If the corresponding bit was set (b1-b4) the event remains active while the button is pressed. In EEPROM mode, the chip is continuously

performing the routine assigned to the push-button while it is pressed. In microcontroller mode, the chip continuously generates interrupts

on nIRQ until the push-button is released. Weak pull-up currents are switched off when bc is high.

The d0, d1 bits set the de-bouncing time period:

d1 d0 De-bouncing Time [ms]

160

0 (Bypassed)

Note:

? Until the de-bouncing time has expired, the crystal oscillator remains switched on, independent of the status of the ex bit in the

Power Management Command. (Because the circuit uses the crystal oscillator signal for timing.)

? If the p4 bit is set, the controller performs the routine assigned to the fourth button when PB1 and PB2 are pressed down

simultaneously. With the addition of this feature, there is a way to build a device that uses 3 buttons, but performs 4 functions.

? It is possible to detect multiple pressed push-buttons, in both modes. In EEPROM mode the controller executes sequentially all the

routines belonging to the pressed buttons.

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