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7480 датащи(PDF) 45 Page - Renesas Technology Corp

номер детали 7480
подробное описание детали  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PDF  98 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7480 датащи(HTML) 45 Page - Renesas Technology Corp

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MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
44
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
Reset Circuit
The microcomputer is put into a reset status by holding the
_____
RESET pin at the “L” level for 2
µs or more when the power source
voltage is 2.7 to 5.5 V and XIN is in stable oscillation.
_____
After that, this reset status is released by returning the RESET pin
to the “H” level. The program starts from the address having the
contents of address FFFF16 as high-order address and the con-
tents of address FFFE16 as low-order address.
Note that the reset input voltage should be 0.32 V or less when
the power source voltage passes 2.7 V.
Fig. 47 Reset circuit diagram
Fig. 48 Reset sequence
RESET
VCC
RESET
VCC
Power source
voltage
0V
Reset input
voltage
0V
0.12VCC
Power ON
(Note)
Note : Reset release voltage VCC = 2.7 V
Power source
voltage
detecting circuit
?
??
?
FFFE16
FFFF16
ADH,L
??
?
?
ADL
ADH
XIN
φ
RESET
Internal reset
Address
Data
SYNC
XIN 2048 clock cycle
Reset address from
the vector table
Notes 1 : The frequency relation between f(X IN) and
is f(XIN)=2·f( ).
2 : The mark “?” means that the address is changeable depending
on the previous state.
φφ



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