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參數(shù)資料
| 型號： | UPD17149GT |
| 廠商： | NEC Corp. |
| 英文描述： | SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 小，通用4位單晶片微控制器 |
| 文件頁數(shù)： | 66/102頁 |
| 文件大?。?/td> | 408K |
| 代理商： | UPD17149GT |
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66
μ
PD17145(A1), 17147(A1), 17149(A1)
Notes 1.
Actually, oscillation stabilization wait time specified by timer 1 elapses before the operation mode
is set. This time is equal to that required for executing about 2048 instructions (approx. 8 ms at
4 MHz).
To reset the microcontroller again when the supply voltage drops, the status in which the voltage
drops below V
POC
must be maintained at least for the duration of the reset detection pulse width
t
SAMP
.
Therefore, reset is actually effected with a delay time of up to t
SAMP
.
The operation is not guaranteed if the supply voltage drops below the rated minimum value (2.7
V).
However, the POC circuit is designed to generate the internal reset signal so long as it is possible,
regardless of oscillation. Therefore, the internal circuitry is reset when the voltage supplied to
it has reached the level at which the circuitry can operate.
If the supply voltage abruptly increases (3 V/ms MIN.), the POC circuit may generate the internal
reset signal, even in an operation mode, to prevent program runaway.
2.
3.
4.
Remark
For the values of V
POC
and t
SAMP
, refer to
22. ELECTRICAL SPECIFICATIONS
.
19.2 Conditions to Use POC Circuit
The POC circuit can be used when the application circuit satisfies the following conditions:
The application circuit does not require a high reliability.
The operating voltage must range from 4.5 to 5.5 V.
The clock frequency must range from 400 kHz to 4 MHz.
The supply voltage must satisfy the ratings of the POC circuit.
Cautions 1.
If the application circuit requires an extremely high reliability, design the circuit so that
the RESET signal is input from an external source.
The current dissipation in the standby mode slightly increases if the POC circuit is
used.
2.
Remark
The guaranteed operating voltage range of the POC circuit is V
DD
= 2.7 to 5.5 V.
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