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UPD17708 Datasheet(PDF) 312 Page - Renesas Technology Corp

Part # UPD17708
Description  MOS INTEGRATED CIRCUIT
PDF  358 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17708 Datasheet(HTML) 312 Page - Renesas Technology Corp

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µPD17704, 17705, 17707, 17708, 17709
Figure 21-4. CE Reset Operation with Clock Stop Instruction
21.2.3 Cautions on CE reset
Because CE reset is effected regardless of the instruction under execution, the following points (1) and (2) must
be noted.
(1) Time to execute timer processing such as watch
When creating a watch program by using the basic timer 0 carry, the processing time of the program must be
kept to within a specific time.
For details, refer to 13.2.6 Cautions on using basic timer 0.
(2) Processing of data and flags used in program
Exercise care in rewriting the data and flags whose contents must not be changed even when CE reset is
effected, such as security code.
An example is shown below.
VDD
CE
XOUT
BTM0CY flag
setting pulse
CE reset timer
carry counter
Set value of CE reset
timer carry counter
Normal operation
5 V
0 V
H
L
H
L
H
L
H
L
H
H
L
L
tSET
N1
1
0
Clock stop status
Halt
status
tSET/2
STOP s instruction
Clock stop
status
released.
Oscillation
starts
CE reset
Program execution starts from address 0
CE reset signal



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