參數(shù)資料
型號： 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)： 23/95頁
文件大?。?/td> 692K
代理商： 6P8B
23
μ
PD6P8, 6P8A, 6P8B
Data Sheet U17848EJ3V0DS
4.3.1 RAM retention flag (bit 3 of P3)
The RAM retention flag indicates whether the supply voltage has fallen below the level at which the contents
of the RAM are lost while the battery is being exchanged or when the battery voltage has dropped.
This flag is at bit 3 of control register 0 (P3).
It is cleared to 0 if the supply voltage drops below the RAM retention detection voltage. If this flag is 0, it can
be judged that the RAM contents have been lost or that power has just been applied. This flag can be used to initialize
the RAM via software. After initializing the RAM and writing the necessary data to it, set this RAM retention flag
to 1 by software. At this time, 1 means that data has been set to the RAM.
Figure 4-2. Supply Voltage Transition and Detection Voltage (
μ
PD6P8)
V
DD
V
POC
/V
ID
0 V
RAM retention flag
(A)
(4)
(3)
(2)
Set to 1
Flag contents
are read
(1)
t
POC detection voltage/
RAM retention detection voltage
V
POC
= V
ID
= 1.8 V (TYP.)
(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 figure, the voltage is lower
than V
ID
. Consequently, the RAM retention flag is cleared to 0.
(4) 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.
Cautions
1. The software developed for the
μ
PD67A, 68A and 69A (using the RAM retention flag) can
be used for the
μ
PD6P8 as is.
2. Unlike the
μ
PD67A, 68A and 69A, the RAM retention detection voltage of the
μ
PD6P8 is the
same as the POC detection voltage. When software is newly developed, it is not necessary
to use the RAM retention flag if only the RAM is initialized by reset.
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