參數(shù)資料
型號： M34554MC-XXXFP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP64
封裝： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64
文件頁數(shù)： 101/137頁
文件大?。?/td> 1606K
代理商： M34554MC-XXXFP
66
4554 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
POF and POF2 instructions
When the POF or POF2 instruction is executed continuously af-
ter the EPOF instruction, system enters the power down state.
Note that system cannot enter the power down state when ex-
ecuting only the POF or POF2 instruction.
Be sure to disable interrupts by executing the DI instruction be-
fore executing the EPOF instruction and the POF or POF2
instruction continuously.
Power-on reset
When the built-in power-on reset circuit is used, the time for the
supply voltage to rise from 0 V to 2.0 V must be set to 100
s or
less. If the rising time exceeds 100
s, connect a capacitor be-
tween the RESET pin and VSS at the shortest distance, and input
“L” level to RESET pin until the value of supply voltage reaches
the minimum operating voltage.
Clock control
Execute the CMCK or the CRCK instruction in the initial setting
routine of program (executing it in address 0 in page 0 is recom-
mended).
The oscillation circuit by the CMCK or CRCK instruction can be
selected only at once. The oscillation circuit corresponding to the
first executed one of these two instruction is valid. Other oscilla-
tion circuits and the ring oscillator stop.
Ring oscillator
The clock frequency of the ring oscillator depends on the supply
voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
Also, the oscillation stabilize wait time after system is released
from reset is generated by the ring oscillator clock. When consid-
ering the oscillation stabilize wait time after system is released
from reset, be careful that the variable frequency of the ring oscil-
lator clock.
External clock
When the external signal clock is used as the source oscillation
(f(XIN)), note that the power down mode (POF and POF2 instruc-
tions) cannot be used.
Difference between Mask ROM version and One Time PROM version
Mask ROM version and One Time PROM version have some dif-
ference of the following characteristics within the limits of an
electrical property by difference of a manufacture process, built-
in ROM, and a layout pattern.
a characteristic value
a margin of operation
the amount of noise-proof
noise radiation, etc.,
Accordingly, be careful of them when swithcing.
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