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参数资料
| 型号： | 4021-DKDB7 |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 17/34页 |
| 文件大小： | 783K |
| 描述： | KIT DEV TEST EZRADIO SI4021 TX |
| 标准包装： | 1 |
| 附件类型： | 测试卡，发射器，868MHz，915MHz |
| 适用于相关产品： | EZRadio? |
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Si4021
17
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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