M30622ECTFP datasheet(15/184 Pages) MITSUBISHI

15 / 184 page

Mitsubishi microcomputers

M16C / 62T Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Reset

Figure 1.6.2. Reset sequence

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 1.6.1 shows the example reset circuit. Figure 1.6.2 shows the reset sequence.

Figure 1.6.1. Example reset circuit

XIN

Microprocessor

mode

BYTE = “H”

BCLK

FFFFC16

FFFFD16

FFFFE16

Content of reset vector

BCLK 24 cycles

More than 20 cycles are needed

Address

FFFFC16

Content of reset vector

Address

FFFFE16

RESET

CS0

FFFFC16

Content of reset vector

Address

Single chip

mode

FFFFE16

(“H”)

Microprocessor

mode

BYTE = “L”

(“H”)

Note 1: In M30623(80-pin package), the BYTE signal has no external pin, and is internally connected to

the CNVSS signal. Accordingly, in the microprocessor mode, BYTE = CNVSS = Vcc.

Note 2: M16C/62T group is not guaranteed to operate in memory expansion and microprocessor modes.

Note 3: M30623(80-pin package) is not provided with the chip select signals (CS0 to CS3).

Vcc

RESET

4.0V

0.8V

Vcc

RESET

Example when Vcc=5V.

More than 20 cycles of XIN are needed.

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