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參數資料
| 型號： | LA6513A |
| 文件頁數： | 16/24頁 |
| 文件大小： | 332K |
| 代理商： | LA6513A |
LC6512A, LC6513A
No.2367–16/24
4-5. HOLD mode release
Release by reset
The HOLD mode is released by setting the HOLD pin to H-Level while applying L-Level to the RES pin. When the
RES pin is set to H-Level again, the normal operation starts. The contents of the memories remain unaffected except
the PC, I/O ports, registers which are initialized by the reset operation.
Since the ceramic resonator mode is used, the reset state must be held until oscillation is fully stabilized (10 ms after
oscillation start) after the HOLD mode is released.
Note: With L-Level applied to the HOLD pin as shown above, the CPU is not reset even when the RES pin is set to L-
Level. This is because the HOLD pin is given priority lest the CPU is reset unnecessarily when the capacitor or
battery-used backup mode causes the CPU peripherals to operate unstably and the RES pin is set to L-Level. Be
careful of the level of the HOLD pin and RES pin also at the initial reset mode when power is applied. When the
HOLD pin is at L-Level, no reset occurs.
4-6. Proper cares in using standby function
When using the HOLD mode, an application circuit and program must be designed with the following in mind.
(1) The supply voltage at the standby state must not be less than specified.
(2) Input timing of each control signal (HOLD, RES, port A, INT, etc.) at the standby initiate/release state.
(3) Release operation must not be overlapped at the time of execution of the HALT instruction.
4-7. Sample application where the standby function is used for power failure backup
Power failure backup is an application where power failure of the main power source is detected by the HOLD pin,
etc. to cause the HOLD mode to be entered so that the current drain is minimized and a backup capacitor is used to
retain the contents of the internal registers even during power failure.
4-7-1. Sample application circuit (ceramic resonator OSC)
Fig. 4-4 shows a ceramic resonator OSC-applied circuit where the standby function is used for power failure backup.
Fig. 4-3 HOLD mode release by reset
Fig. 4-4 Sample Application Circuit
100V
AC
Power
Supply
Unit(resistance:
, capacitance:F)
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