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UPD17708 데이터시트(PDF) 319 Page - NEC

부품명 UPD17708
상세설명  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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제조업체  NEC [NEC]
홈페이지  http://www.nec.com/
Logo NEC - NEC

UPD17708 데이터시트(HTML) 319 Page - NEC

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µPD17704, 17705, 17707, 17708, 17709
(2) Releasing from clock stop status
If the device is released from the backup status when supply voltage VDD is backed up at 2.2 V by using the
clock stop status, VDD must be raised to 3.5 V or more within tSET/2 after the clock stop status has been released
by INT pin interrupt or high level input to port 0D.
As shown in Figure 21-9, the device is released from the clock stop status by means of CE reset. However,
because the power-ON clear voltage is changed to 3.5 V tSET/2 after the clock stop status has been released,
power-ON reset is effected unless VDD is 3.5 V or higher.
The same applies when VDD is raised.
Figure 21-9. Releasing from Clock Stop Status
P0D
BTM0CY flag
setting pulse
XOUT
5 V
3.5 V
2.2 V
0 V
0 V
H
L
H
L
Power-ON
clear signal
H
L
Power-ON
clear voltage
Backup in clock stop
status
Halt status
tSET/2
Power-ON clear voltage changes
to 3.5 V at this point.
Therefore, VDD must be 3.5 V
or higher before this point.
Normal operation
Backup
STOP s instruction
H
VDD
Program starts
Power-ON clear voltage changes
to 2.2 V at this point.
Therefore, VDD must be 3.5 V
or higher before this point.
tSET: basic timer 0 setting time



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