M38063M2AFP datasheet(28/58 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

3806 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Reset Circuit

______

To reset the microcomputer, the RESET pin should be held at an

______

“L” level for 2

µs or more. Then the RESET pin is returned to an

“H” level (Note 1), reset is released. Internal operation does not

begin until after 8 to 13 XIN clock cycles are completed. After the

reset is completed, the program starts from the address contained

in address FFFD16 (high-order byte) and address FFFC16 (low-or-

der byte).

Make sure that the reset input voltage is less than 0.8 V for VCC of

4.0 V (Note 2).

Note 1. The power source voltage should be between the follow-

ing voltage.

• Between 3.0 V and 5.5 V for standard version

• Between 4.0 V and 5.5 V for extended operating tem-

perature version

• Between 2.7 V and 5.5 V for high-speed version

Note 2. Reset input voltage is less than the following voltage.

• 0.6 V for VCC = 3.0 V

• 0.8 V for VCC = 4.0 V

• 0.54 V for VCC = 2.7 V

Fig. 23 Internal status of microcomputer after reset

Fig. 22 Example of reset circuit

4.0V

0.8V

VCC

RESET

Power source

voltage

Reset input

voltage

VSS

M51953AL

0.1

µ F

3806 group

Note. ! : Undefined

V : The initial values of CM1 are determined by the level at the

CNVSS pin.

The contents of all other registers and RAM are undefined

after a reset, so they must be initialized by software.

(000116) • • •

Timer 2

Port P0 direction register

Port P1 direction register

Port P2 direction register

Port P3 direction register

Port P4 direction register

Port P5 direction register

Port P6 direction register

Port P7 direction register

Port P8 direction register

Timer XY mode register

Serial I/O1 status register

Serial I/O1 control register

UART control register

Serial I/O2 control register

Timer 1

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

(12)

(13)

(14)

(15)

(16)

(17)

(18)

(19)

(20)

(21)

(22)

(23)

(24)

(25)

(26)

(27)

(28)

(29)

(30)

(31)

(32)

(000316) • • •

(000516) • • •

(000716) • • •

(000916) • • •

(000B16) • • •

(000D16) • • •

(000F16) • • •

(001116) • • •

(001916) • • •

(001A16) • • •

(001B16) • • •

(001D16) • • •

(002016) • • •

(002116) • • •

(002216) • • •

(002316) • • •

(002416) • • •

(002516) • • •

(002616) • • •

(002716) • • •

(003416) • • •

(003616) • • •

(003716) • • •

(003A16) • • •

(003B16) • • •

(003C16) • • •

(003D16) • • •

(003E16) • • •

Address

Prescaler 12

Prescaler X

Timer X

Prescaler Y

Timer Y

AD/DA control register

D-A1 conversion register

D-A2 conversion register

Interrupt edge selection register

CPU mode register

Interrupt request register 1

Interrupt request register 2

Interrupt control register 1

Interrupt control register 2

Processor status register

Program counter

0016

00 0 0 0 0

0016

00 0 0 1 0

FF16

0016

FF16

0116

FF16

0016

11 1 0 0 0

10 0 0 0 0

0016

Contents of address FFFC16

!! !! ! 1

(PS)

(PCH)

(PCL)

Contents of address FFFD16

0016

(003F16) • • •

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