HT47C20 datasheet(20/56 Pages) HOLTEK

20 / 56 page

HT47C20

January 18, 2000

The states of the registers are summarized in the following table:

Reset

(power on)

WDT time-out

(normal

operation)

RES reset

(normal

operation)

RES reset

(HALT)

WDT

time-out

(HALT)

TMRAH

xxxx xxxx

uuuu uuuu

TMRAL

xxxx xxxx

uuuu uuuu

TMRC

0000 1---

uuuu u---

TMRBH

xxxx xxxx

uuuu uuuu

TMRBL

xxxx xxxx

uuuu uuuu

ADCR

1xxx --00

uuuu --uu

Program

Counter

000H

000H*

MP0

xxxx xxxx

uuuu uuuu

MP1

xxxx xxxx

uuuu uuuu

ACC

xxxx xxxx

uuuu uuuu

TBLP

xxxx xxxx

uuuu uuuu

TBLH

xxxx xxxx

uuuu uuuu

STATUS

--00 xxxx

--1u uuuu

--uu uuuu

--01 uuuu

--11 uuuu

INTC0

-000 0000

-uuu uuuu

INTC1

---0 ---0

---u ---u

RTCC

--x0 0111

--uu uuuu

1111 1111

uuuu uuuu

Note: ²*² refers to ²warm reset²

²u² means ²unchanged²

²x² means ²unknown²

RES

V DD

Reset circuit

WD T

T i m e - out

Re s e t

Ext e r n a l

Co l d

Re s e t

HA L T

RES

P o we r - o n De t e c t i o n

SS T

10- bi t R i ppl e

C ount e r

OS C 1

W a r m R es et

Reset configuration

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