3802 datasheet(29/52 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

3802 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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) · · ·

Prescaler X

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

Serial I/O1 status register

Serial I/O1 control register

Timer X

UART control register

Serial I/O2 control register

Prescaler 12

Timer 1

Timer XY mode register

(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)

(000316) · · ·

(000516) · · ·

(000716) · · ·

(000916) · · ·

(000B16) · · ·

(000D16) · · ·

(001916) · · ·

(001A16) · · ·

(001B16) · · ·

(001D16) · · ·

(002016) · · ·

(002116) · · ·

(002216) · · ·

(002316) · · ·

(002416) · · ·

(002516) · · ·

(002616) · · ·

(002716) · · ·

(002B16) · · ·

(003416) · · ·

(003616) · · ·

(003716) · · ·

(003A16) · · ·

(003B16) · · ·

(003C16) · · ·

(003D16) · · ·

(003E16) · · ·

Address

Timer 2

Prescaler Y

Timer Y

PWM control register

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

FF16

0016

FF16

0116

0016

11 1 0 0 0

0016

Contents of address FFFC16

!! ! ! ! 1

(PS)

(PCH)

(PCL)

Contents of address FFFD16

0016

(003F16) · · ·

10 0 0 0 0

FF16

00 0 0 1 0

0016

00 0 0 0 0

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 (the power source voltage should be between 4.0 V and 5.5

V), reset is released. Internal operation begin until after 8 to 13 XIN

clock cycles are completed. After the reset is completed, the pro-

gram starts from the address contained in address FFFD16 (high-

order byte) and address FFFC16 (low-order byte).

Make sure that the reset input voltage is less than 0.6 V for VCC of

3.0 V (Extended operating temperature version : the reset input

voltage is less than 0.8 V for VCC of 4.0 V).

Fig. 27 Internal status of microcomputer after reset

Fig. 26 Example of reset circuit

4.0V

0.8V

VCC

RESET

Power source

voltage

Reset input

voltage

VSS

M51953AL

0.1

µ F

3802 group

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