HD404324FS datasheet(16/103 Pages) RENESAS

16 / 103 page

HD404054 Series/HD404094 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

Interrupt enable flag

(IE)

Inhibits all interrupts

flags/mask

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)

(DCR0–

DCR4)

All bits 0

Port mode register A

(PMRA)

- - 00

Refer to description of port mode register A

Port mode register B

(PMRB)

- - - 0

Refer to description of port mode register B

Port mode register C

bits 3, 2, 1

(PMRC3,

PMRC2,

PMRC1)

000 -

Refer to description of port mode register C

Detection edge select

(ESR2)

00 - -

Disables edge detection

Timer/

Timer mode register A

(TMA)

- 000

Refer to description of timer mode register A

counters,

Timer mode register C1 (TMC1)

0000

Refer to description of timer mode register C1

serial

Timer mode register C2 (TMC2)

- 000

Refer to description of timer mode register C2

interface

Timer mode register D1 (TMD1)

0000

Refer to description of timer mode register D1

Timer mode register D2 (TMD2)

0000

Refer to description of timer mode register D2

Serial mode register 1A (SM1A)

0000

Refer to description of serial mode register 1A

Serial mode register 1B (SM1B)

- - X0

Refer to description of serial mode register 1B

Prescaler S

(PSS)

$000

—

Timer counter A

(TCA)

$00

—

Timer counter C

(TCC)

$00

—

Timer counter D

(TCD)

$00

—

Timer write register C

(TWCU,

TWCL)

$X0

—

Timer write register D

(TWDU,

$X0

—

Octal counter

TWDL)

000

—

Comparator

Compare enable

(CER)

0 - 00

Refer to description of voltage comparator

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