參數(shù)資料
型號(hào): 6P8B
廠商: NEC Corp.
英文描述: MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
中文描述: 馬鞍山集成電路4位單片機(jī)的紅外遙控傳輸
文件頁數(shù): 24/95頁
文件大?。?/td> 692K
代理商: 6P8B
24
μ
PD6P8, 6P8A, 6P8B
Data Sheet U17848EJ3V0DS
Figure 4-3. Supply Voltage Transition and Detection Voltage (
μ
PD6P8A, 6P8B)
(1) If the supply voltage rises after the battery has been set, and exceeds V
POC
(POC detection voltage),
reset is cleared. Because the supply voltage rises from 0 V, which is lower than V
ID
(RAM retention
detection voltage), the RAM retention flag remains in the initial status 0.
(2) The supply voltage has now risen to the level at which the device can operate. Write the necessary data
to the RAM and set the RAM retention flag to 1.
(3) The device is reset if the supply voltage drops below V
POC
. At point (A) in the above figure, the RAM
retention flag remains 1 because the supply voltage is higher than V
ID
at this point.
(4) If the RAM retention flag is checked by software after reset has been cleared, it is 1. This means that
the contents of the RAM have not been lost. It is therefore not necessary to initialize the RAM by
software.
(5) The device is reset if the supply voltage drops below V
POC
. At point (B) in the figure, the voltage is lower
than V
ID
. Consequently, the RAM retention flag is cleared to 0.
(6) If the RAM retention flag is checked by software after reset has been cleared, it is 0. This means that
the contents of the RAM may have been lost. If this case, initialize the RAM by software.
V
DD
V
POC
V
ID
0 V
RAM retention flag
(A)
(B)
(6)
(5)
(4)
(3)
(2)
Set to 1
Flag contents
are read
Flag contents
are read
(1)
t
POC detection voltage
(Refer to
8. POC CIRCUIT
)
V
POC
= 1.8 V (TYP.)
RAM retention detection voltage
V
ID
= 1.6 V (TYP.)
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