HD4048412 データシートの表示（PDF） - Renesas Electronics

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HD4048412

4-Bit Single-Chip Microcomputer

Renesas Electronics 

HD404849 Series

Table 1 Initial Values After MCU Reset

Item

Abbr.

Program

counter

(PC)

Status flag

(ST)

Stack pointer

(SP)

Interrupt

Interrupt enable flag (IE)

flags/mask

Interrupt request flag (IF)

Interrupt mask

(IM)

I/O

Port data register

(PDR)

Data control register

(DCD0,

DCD1)

(DCD2)

(DCR0–

DCR3,

DCR6,

DCR7)

Port mode register A (PMRA)

Port mode register B (PMRB)

Port mode register C

bits 3, 1, 0

(PMRC3,

PMRC1,

PMRC0)

Detection edge select (ESR1)

register 1

Detection edge select (ESR2)

register 2

Timer/

counters,

serial

interface

Timer mode register A (TMA)

Timer mode register B1 (TMB1)

Timer mode register B2 (TMB2)

Timer mode register C1 (TMC1)

Timer mode register C2 (TMC2)

Timer mode register D1 (TMD1)

Timer mode register D2 (TMD2)

Initial

Value

$0000

1

$3FF

0

Contents

Indicates program execution point from start

address of ROM area

Enables conditional branching

Stack level 0

Inhibits all interrupts

0

Indicates there is no interrupt request

1

Prevents (masks) interrupt requests

All bits 1 Enables output at level 1

All bits 0 Turns output buffer off (to high impedance)

---0

All bits 0

- - 00

- 000

000

Refer to description of port mode register A

Refer to description of port mode register B

Refer to description of port mode register C

0000

00 - -

0000

Disables edge detection

Disables edge detection

Refer to description of timer mode register A

0000

- - 00

0000

- 000

0000

0000

Refer to description of timer mode register B1

Refer to description of timer mode register B2

Refer to description of timer mode register

C1

Refer to description of timer mode register

C2

Refer to description of timer mode register

D1

Refer to description of timer mode register

D2

16

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