HT46C63 datasheet(13/44 Pages) HOLTEK

13 / 44 page

HT46R63/HT46C63

Rev. 1.90

May 17, 2004

Bit No. Label

Function

EIF1

External interrupt 1 request flag

(1= active; 0= inactive)

6TF

Timer/Event Counter overflow request

flag (1= active; 0= inactive)

Unused bit, read as

²0²

INTC1 Register

ETBI

Controls the time base interrupt

(1= enabled; 0= disabled)

EADI

Controls the A/D converter interrupt

(1= enabled; 0= disabled)

ERTI

Controls the real time clock interrupt

(1= enabled; 0= disabled)

Unused bit, read as

²0²

TBF

Time base time-out interrupt 0 request

flag (1= active; 0= inactive)

ADF

End of A/D conversion interrupt request

flag (1= active; 0= inactive)

RTF

RTC time-out interrupt request flag

(1= active; 0= inactive)

Unused bit, read as

²0²

Oscillator Configuration

There are four oscillator circuits implemented in the mi-

cro-controller.

Two of them are designed for system clocks, namely the

external RC oscillator and the crystal oscillator, which

are determined by options. The HALT mode stops the

system oscillator and resists the external signal to con-

serve power. Another one is a 32768Hz crystal oscilla-

tor, which only provides use for real time clock. The

other one is a built-in 12KHz RC oscillator, which is used

for WDTOSC.

If the system clock uses the external RC oscillator, an

external resistor between OSC1 and VDD is required

and the resistance should range from 24k

W to 1MW. The

system clock, divided by 4, is available on OSC2, which

can be used to synchronize external logic.

If the system clock uses the crystal oscillator, a crystal

across OSC1 and OSC2 is needed to provide the feed-

back and phase shift required for the oscillator, and no

other external components are demanded. Instead of a

crystal, the resonator can also be connected between

OSC1 and OSC2 to get a frequency reference, but two

external capacitors in OSC1 and OSC2 are required.

If the RTCOSC is used, a crystal across OSC3 and

OSC4 is needed to provide the feedback and phase

shift required for the oscillator, and no other external

components are demanded.

Watchdog Timer

- WDT

The clock source of WDT (and LCD, RTC, Time Base )

is implemented by a dedicated crystal oscillator

(32.768kHz: RTCOSC) or instruction clock (system fre-

quency divided by 4: fSYS/4) or a dedicated RC oscillator

(12KHz:WDTOSC) decided by options. This timer is de-

signed to prevent a software malfunction or sequence

from jumping to an unknown location with unpredictable

C r y s t a l O s c i l l a t o r

f o r s y s t e m c l o c k

E x t e r n a l R C O s c i l l a t o r

f o r s y s t e m c l o c k

O S C 1

O S C 2

N M O S O p e n D r a i n

O S C 2

f S Y S / 4

O S C 1

V D D

C r y s t a l O s c i l l a t o r

f o r R T C O S C

O S C 4

O S C 3

3 2 7 6 8 H z

X ' t a l

System Oscillator

f S Y S / 4

W D T t i m e - o u t

R T C O S C

f S

W D T O S C

C L R W D T

O p t i o n s

T i m e b a s e : f S / 2 1 2 ~ f S / 2 1 5

L C D f r e q u e n c y : f S / 2 2 ~ f S / 2 8

R T C : f S / 2 8 ~ f S / 2 1 5

R T C C . 2 ~ R T C C . 0

R E S

1 6 - B i t C o u n t e r

1 5 - B i t C o u n t e r

4 t o 1 M U X

7 t o 1 M U X

8 t o 1 M U X

Watchdog Timer

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