UPD17073 NEC, UPD17073 Datasheet - Page 201

• Manufacturer Part Number: UPD17073
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
• Manufacturer: NEC

BTM0CY flag setting pulse
BTM0CY flag setting pulse
Operation in Figure 20-8
Operation in Figure 20-8
(a) When BTM0CY flag is never detected (SKT1 BTM0CY or SKF1 BTM0CY is not executed)
(b) To detect power failure with BTM0CY flag
SKTI instruction
BTM0CY
BTM0CY
V
V
CE
CE
DD
DD
3 V
0 V
3 V
0 V
H
H
H
H
H
H
L
L
L
L
L
L
<1>
<1>
BTM0CY = 0
Power failure
<2>
<2> <6> <14>
<3> <11>
<3>
Figure 20-9. Operation of BTM0CY Flag
<6>
Timer time changed
Timer time changed
<13>
<5>
<16>
<8>
BTM0CY = 1
Not power failure
<15>
<7>
<6>
<14>
<13>
<5>
STOP
STOP
0000 B
0000 B
<12>
<4>
PD17072,17073
<17>
<9>
BTM0CY = 1
Not power failure
<15>
<7>
<14>
<6>
201
<1>
<1>