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Si4020
 
 
16
 
6. Low Battery Detector Command
bit     15     14     13     12     11     10
9
8
7
6
5
4
3
2
1
0
POR
 
1
1
0
0
0
0
1
0
0
0
0
t4
t3
t2
t1
t0
C200h
The 5-bit value T of <t4 : t0> determines the threshold voltage V
lb
 of the detector:
 
V
lb
 = 2.25 V + T * 0.1 V
7. Sleep Command
bit     15     14     13     12     11     10
9
8
7
6
5
4
3
2
1
0
POR
 
1
1
0
0
0
1
0
0
s7     s6     s5     s4     s3     s2     s1     s0
C400h
The effect of this command depends on the Power Management Command. It immediately disables the power amplifier (if a0=1 and
ea=0) and the synthesizer (if a1=1 and es=0). Stops the crystal oscillator after S periods of the microcontroller clock (if a1=1 and 
ex=0)  to  enable  the  microcontroller  to  execute  all  necessary  commands  before  entering  sleep  mode  itself.  The  8-bit  value  S  is 
determined by bits <s7 : s0>.
8. Push-Button Command
bit     15     14     13     12     11     10
9
8
7
6
5
4
3
2
1
0
POR
 
1
1
0
0
1
0
1
0
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]
0
0
160
0
1
40
1
0
10
1
1
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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