M30218 Datasheet, PDF (15/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

Reset
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Reset
There are two kinds of resets; hardware and software. In both cases, operation is the same after the reset.
(See “Software Reset” for details of software resets.) This section explains on hardware resets.
When the supply voltage is in the range where operation is guaranteed, a reset is effected by holding the
reset pin level “L” (0.2VCC max.) for at least 20 cycles. When the reset pin level is then returned to the “H”
level while main clock is stable, the reset status is cancelled and program execution resumes from the
address in the reset vector table.
Figure DA-1 shows the example reset circuit. Figure DA-2 shows the reset sequence.
RESET
VCC
5V
VCC
0V
5V
RESET
0V
Example when f(XIN) = 10MHz and VCC = 5V.
Figure DA-1. Example reset circuit
4.0V
0.8V
XIN
More than 20 cycles are needed
RESET
BCLK
(Internal clock)
BCLK 24cycles
Address
(Internal address
signal)
Figure DA-2. Reset sequence
FFFFC16
FFFFE16
Content of reset vector
14