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M30218M4

M30218 Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Mitsumi 

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 10 shows the example reset circuit. Figure 11 shows the reset sequence.

RESET

VCC

5V

VCC

0V

5V

RESET

0V

Example when f(XIN) = 10MHz and VCC = 5V.

Figure 10. 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 11. Reset sequence

FFFFC16

FFFFE16

Content of reset vector

15

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