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UPD17708 Datasheet(PDF) 154 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) 154 Page - Renesas Technology Corp

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µPD17704, 17705, 17707, 17708, 17709
152
13.2.3 Flip-flop and BTM0CY flag
The flip-flop is set at fixed intervals and its status is detected by the BTM0CY flag of the basic timer 0 carry
register.
When the BTM0CY flag is read, it is reset to “0” (Read & Reset).
The BTM0CY flag is “0” at power-ON reset, and is “1” at CE reset and on execution of the clock stop
instruction. Therefore, this flag can be used to detect a power failure.
The BTM0CY flag is not set after power application until an instruction that reads it is executed. Once the
read instruction has been executed, the flag is set at fixed intervals.
Figure 13-4 shows the configuration of the basic timer 0 carry register.
Figure 13-4. Configuration of Basic Timer 0 Carry Register
Name
Flag symbol
b3
0
b2
0
b1
0
b0
B
T
M
0
C
Y
Address
17H
Read/Write
R & Reset
Basic timer 0 carry
Power-ON reset
WDT&SP reset
CE reset
R: Retained
Clock stop
0
1
0
R
1
R
Flip-flop is not set
Flip-flop is set
Fixed to “0”
Detects status of flip-flop
000



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