HD404394 Ver la hoja de datos (PDF) - Hitachi -> Renesas Electronics

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HD404394

4-bit microcomputers

Hitachi -> Renesas Electronics 

HD404344R Series/HD404394 Series

Table 1 Initial Values After MCU Reset

Item

Program counter

Abbr.

(PC)

Initial Value

$0000

Status flag

Stack pointer

Interrupt

flags/mask

Interrupt enable flag

Interrupt request flag

(ST)

(SP)

(IE)

(IF)

1

$3FF

0

0

Interrupt mask

(IM)

1

I/O

Port data register

(PDR)

All bits 1

Data control register (DCD0, DCD1) All bits 0

Port mode register A

(DCR0,- DCR3) All bits 0

(PMRA)

- 000

Port mode register B (PMRB)

0--0

Port mode register C (PMRC)

---0

Timer/

Timer mode register B1 (TMB1)

counters, serial

interface

Timer mode register B2 (TMB2)

0000

- - 00

Timer mode register C (TMC)

0000

Serial mode register (SMR)

0000

Prescaler S

Timer counter B

Timer counter C

Timer write register B

Timer write register C

Octal counter

(PSS)

$000

(TCB)

$00

(TCC)

$00

(TWBU, TWBL) $X0

(TWCU, TWCL) $X0

000

Contents

Indicates program execution

point from start address of ROM

area

Enables conditional branching

Stack level 0

Inhibits all interrupts

Indicates there is no interrupt

request

Prevents (masks) interrupt

requests

Enables output at level 1

Turns output buffer off (to high

impedance)

Refer to description of port mode

register A

Refer to description of port mode

register B

Refer to description of port mode

register C

Refer to description of timer

mode register B1

Refer to description of timer

mode register B2

Refer to description of timer

mode register C

Refer to description of serial

mode register

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