7480 Datasheet, PDF (45/98 Pages) Bi technologies – 7/8 Diameter 5-Turn Wirewound Precision Potentiometer

PRELIMINARY _{NSootimcee: pTahriasmisentroict} ^{alimfinitsalasrpeescuifbicjeactitotno. change.}
Reset Circuit
The microcomputer is put into a reset status by holding the
_____
RESET pin at the “L” level for 2µs 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.
MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
RESET
Power ON
VCC
Power source
voltage
0V
Reset input
voltage
0V
(Note)
0.12VCC
Note : Reset release voltage VCC = 2.7 V
RESET
VCC
Power source
voltage
detecting circuit
Fig. 47 Reset circuit diagram
XIN
φ
RESET
Internal reset
Address
Data
SYNC
?
?
?
?
?
?
? FFFE16 FFFF16 ADH,L
?
ADL
ADH
Reset address from
the vector table
XIN 2048 clock cycle
Notes 1 : The frequency relation between f(X IN) and φ is f(XIN)=2·f(φ).
2 : The mark “?” means that the address is changeable depending
on the previous state.
Fig. 48 Reset sequence
44