HD404612FS datasheet(17/91 Pages) RENESAS

17 / 91 page

HD404618 Series

Reset

The MCU is reset by inputting a high-level voltage to the RESET pin. At power-on or when stop mode is

cancelled, RESET must be high for at least one t

RC to enable the oscillator to stabilize.

During operation, RESET must be high for at least two instruction cycles.

I/O pins go to high-impedance at power-on.

Initial values after MCU reset are shown in table 1.

Table 1 Initial Values After MCU Reset

Item

Abbr.

Initial Value Contents

Program counter

(PC)

$0000

Indicates program execution

point from start address of ROM

area

Status flag

(ST)

Enables conditional branching

Stack pointer

(SP)

$3FF

Stack level 0

V register (bank register)

(V)

Bank 0 (memory)

Interrupt flags/mask Interrupt enable flag

(IE)

Inhibits all interrupts

Interrupt request flag

(IF)

Indicates there is no interrupt

request

Interrupt mask

(IM)

Prevents (masks) interrupt

request

I/O

Port data register

(PDR)

All bits 1

Enables output at level 1

Data control register

(DCR)

All bits 0

Turns output buffer off (to high

impedance)

Port mode register A

(PMRA)

0000

Refer to description of port mode

Port mode register B

(PMRB)

0000

Refer to description of port mode

Timer/

counters, serial

interface

Timer mode register A

(TMA)

0000

Refer to description of timer

mode register A

Timer mode register B

(TMB)

0000

Refer to description of timer

mode register B

Timer mode register C

(TMC)

0000

Refer to description of timer

mode register C

Serial mode register

(SMR)

0000

Refer to description of serial

mode register

Prescaler S

$000

—

Prescaler W

$00

—

Timer counter A

(TCA)

$00

—

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