HD404369F datasheet(19/117 Pages) RENESAS

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HD404369 Series

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

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 requests

I/O

Port data register

(PDR)

All bits 1

Enables output at level 1

Data control register

(DCD0-

DCD2)

All bits 0

Turns output buffer off (to high impedance)

(DCD3)

- - 00

(DCR0–

DCR6,

DCR8,

DCR9)

All bits 0

(DCR7)

- 000

Port mode register A

(PMRA)

0000

Refer to description of port mode register A

Port mode register B

bits 2–0

(PMRB2–

PMRB0)

000

Refer to description of port mode register B

Port mode register C

(PMRC)

00 - 0

Refer to description of port mode register C

Timer/count-

ers, serial

interface

Timer mode register A

(TMA)

0000

Refer to description of timer mode register A

Timer mode register B1 (TMB1)

0000

Refer to description of timer mode register B1

Timer mode register B2 (TMB2)

- 000

Refer to description of timer mode register B2

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

(PSS)

$000

—

Prescaler W

(PSW)

$00

—

Timer counter A

(TCA)

$00

—

Timer counter B

(TCB)

$00

—

Timer counter C

(TCC)

$00

—

Timer write register B

(TWBU,

TWBL)

$X0

—

Timer write register C

(TWCU,

TWCL)

$X0

—

Octal counter

000

—

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