UPD17016 Datasheet, PDF (152/324 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17016, 17017
Figure 13-11. Operation of BTM0CY Flag
(a) When BTM0CY flag never detected (SKT1 BTM0CY or SKF1 BTM0CY is not executed)
VDD
CE
Timer carry
FF setting pulse
BTM0CY
Operation in
Figure 13-10
5V
0V
H
L
H
L
H
L
<1> <2> <6>
<3>
<5> <8>
<6>
Timer time
changed
<7>
<5> <4> <9>
<6>
STOP
0000 B
<7>
<1>
(b) When detecting power failure by BTM0CY flag
5V
VDD
0V
H
CE
L
Timer carry ^H
FF setting pulse _L
H
BTM0CY
SKT1 BTM0CY instruction
L
Operation in Figure 13-10
< 1 > < 2 > <6><14>
< 13 >
< 16 >
< 14 >
<3>
< 11 >
BTM0CY = 0
Power failure
Timer time
changed
< 15 >
BTM0CY = 1
Not power failure
< 13 > < 12 > < 17 >
< 14 >
STOP
0000 B
< 15 >
BTM0CY = 1
Not power failure
<1>
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