D17133CS datasheet(186/289 Pages) NEC

186 / 289 page

CHAPTER 16 RESET

The following 3 types of resets are provided in the

µPD17120 series.

<1> Reset by input to RESET.

<2> The power-on/power-down reset function when power is turned on or supply voltage drops.

<3> The address stack overflow/underflow reset function.

16.1 RESET FUNCTIONS

The reset functions are used to initialize device operations. The state to be initialized depends on the type of reset.

Table 16-1. State of Each Hardware Unit When Reset

Reset Type

• RESET Input during

Operation

Standby Mode

• Stack Overflow or

• Built-in Power-ON/Power-

Underflow

DOWN Reset during

Hardware

Operation

Standby Mode

Program Counter

0000H

Port

Input/Output mode

Input

Output latch

Undefined

General-Purpose

Other than DBF

Undefined

Retains the status immedi-

Undefined

Data Memory

ately preceding the resetting.

DBF

Undefined

System Register

Other than WR

Undefined

Retains the status immedi-

Undefined

ately preceding the resetting.

Control Register

SP=5H; IRQTM1=1; TMEN=1; CMPVREF23=1Note;

SP=5H; INT retains the

CMPRSLT=1Note; INT retains the status of the INT pin at status of the INT pin at the

the time; all the others go to 0.

time; all the others go to 0.

Refer to 19.2 RESERVED SYMBOLS.

Timer

Count register

00H

Undefined

Modulo register

FFH

Serial Interface's Shift Register

Undefined

Retains the status immedi-

Undefined

(SIOSFR)

ately preceding the resetting.

Note

µPD17132, 17133, 17P132, and 17P133 only.

171

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