HD404364 データシートの表示（PDF） - Renesas Electronics

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HD404364

4-bit HMCS400-Series microcomputer

Renesas Electronics 

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)

1

Enables conditional branching

Stack pointer

(SP)

$3FF

Stack level 0

Interrupt Interrupt enable flag (IE)

0

flags/mask

Inhibits all interrupts

Interrupt request flag (IF)

0

Indicates there is no interrupt request

Interrupt mask

(IM)

1

Prevents (masks) interrupt requests

I/O

Port data register

(PDR) All bits 1 Enables output at level 1

Data control register

(DCD0- All bits 0

DCD2)

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 (PMRB2– 000

bits 2–0

PMRB0)

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- Timer mode register A

ers, serial

interface

(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, $X0

—

TWBL)

Timer write register C (TWCU, $X0

—

TWCL)

Octal counter

000

—

17

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