參數(shù)資料
型號： M34571G4
廠商： Renesas Technology Corp.
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述： 單芯片4位微機的CMOS
文件頁數(shù)： 43/126頁
文件大?。?/td> 1627K
代理商： M34571G4
Rev.1.02
REJ03B0179-0102
May 25, 2007
Page 43 of 124
4571 Group
(1) Voltage drop detection circuit interrupt request flag
(VDF)
Voltage drop detection circuit interrupt request flag (VDF) is set
to “1” when the supply voltage goes the defined value (V
INT
) or
less. Moreover, voltage drop detection circuit interrupt request
flag (VDF) is cleared to “0” when the supply voltage goes the
defined value (V
INT
) or more. The state of the interrupt request
flag can be examined with the skip instruction (SNZVD). Use the
interrupt control register V2 to select an interrupt or a skip
instruction. Unlike other interrupt request flags, even when the
interrupt occurs or the skip instruction is executed, the voltage
drop detection circuit interrupt request flag is not cleared to “0”.
(2) Voltage drop detection circuit reset
System reset is performed when the supply voltage goes the
defined value (V
RST
-
) or less (“L” level is not output to RESET
pin.). However, unlike the normal system reset, the oscillation
circuit is stopped.
When the supply voltage goes the defined value (V
RST
-
) or more,
the oscillation circuit goes to be in the operating enabled state
and system reset is released.
Fig 45. Voltage drop detection circuit operation waveform
Fig 46. V
DD
and V
RST
-
(3) Note on voltage drop detection circuit
The voltage drop detection circuit detection voltage of this
product is set up lower than the minimum value of the supply
voltage of the recommended operating conditions.
When the supply voltage of a microcomputer falls below to the
minimum value of recommended operating conditions and rises
again, depending on the capacity value of the bypass capacitor
added to the power supply pin, the following case may cause
program failure (Figure 46);
supply voltage does not fall below to V
RST
-
, and
its voltage rises again with no reset.
In such a case, please design a system which supply voltage is
once reduced below to V
RST
-
and re-goes up after that.
V
DD
Voltage drop detection circuit
interrupt request flag (VDF)
V
RST+
(reset release voltage)
V
RST
-
(reset occurrence voltage)
Voltage drop
detection circuit
reset signal
Notes 1: Microcomputer starts operation after input clock is counted 5400 to 5424 times.
2: “L” level is not output from RESET pin. The oscillation circuit is stopped.
3: After microcomputer starts operation, the detection of the interrupt occurrence voltage is performed.
(Note 1)
(Note 2)
(Note 3)
V
INT
(interrupt occurrence voltage)
V
DD
V
RST+
V
RST
-
V
DD
V
RST+
V
RST
-
Recommended operating condition
min.value
Normal operation
Reset
No reset
Program failure may occur.
Recommended operating condition
min.value
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