HT56R656 datasheet(72/108 Pages) HOLTEK

72 / 108 page

HT56R62/HT56R65

HT56R642/HT56R644/HT56R654/HT56R656

Rev. 1.00

July 20, 2009

A u t o m a t i c a l l y C l e a r e d b y I S R

e x c e p t

f o r A D F , T B F , R T F a n d T 2 F

M a n u a l l y S e t o r C l e a r e d b y S o f t w a r e

A u t o m a t i c a l l y D i s a b l e d b y I S R

C a n b e E n a b l e d M a n u a l l y

P r i o r i t y

H i g h

I n t e r r u p t

P o l l i n g

E x t e r n a l I n t e r r u p t

R e q u e s t F l a g E I F 1

E E I 0

T i m e r / E v e n t C o u n t e r 0

I n t e r r u p t R e q u e s t F l a g T 0 F

E E I 1

E T 0 I

T i m e r / E v e n t C o u n t e r 1

I n t e r r u p t R e q u e s t F l a g T 1 F

E T 1 I

S P I / I 2 C

I n t e r r u p t R e q u e s t F l a g S I M F

E S I M

E x t e r n a l I n t e r r u p t

R e q u e s t F l a g E I F 0

M u l t i - f u n c t i o n

I n t e r r u p t R e q u e s t F l a g M F F

E M F I

E M I

L o w

T i m e B a s e

I n t e r r u p t R e q u e s t F l a g T B F

E A D I

R e a l T i m e C l o c k

I n t e r r u p t R e q u e s t F l a g R T F

E R T I

A / D C o n v e r t e r

I n t e r r u p t R e q u e s t F l a g A D F

E T B I

E P I

E x t e r n a l P e r i p h e r a l

I n t e r r u p t R e q u e s t F l a g P E F

T i m e r / E v e n t C o u n t e r 2

I n t e r r u p t R e q u e s t F l a g T 2 F

E T 2 I

N o t e t h a t n o t a l l d e v i c e s c o n t a i n T i m e r / E v e n t C o u n t e r 2 .

Interrupt Structure

interrupt vector at location 04H or 08H, will take place.

When the interrupt is serviced, the external interrupt

request flags, EIF0 or EIF1, will be automatically reset

and the EMI bit will be automatically cleared to disable

other interrupts. Note that any pull-high resistor

selections on this pin will remain valid even if the pin is

used as an external interrupt input.

The INTEDGE register is used to select the type of active

edge that will trigger the external interrupt. A choice of ei-

ther rising and falling edge types can be chosen along

with an option to allow both edge types to trigger an exter-

nal interrupt. Note that the INTEDGE register can also be

used to disable the external interrupt function.

The external interrupt pins are connected to an internal

filter to reduce the possibility of unwanted external inter-

rupts due to adverse noise or spikes on the external in-

terrupt input signal. As this internal filter circuit will

consume a limited amount of power, a configuration op-

tion is provided to switch off the filter function, an option

which may be beneficial in power sensitive applications,

but in which the integrity of the input signal is high. Care

must be taken when using the filter on/off configuration

option as it will be applied not only to both the external

interrupt pins but also to the Timer/Event Counter exter-

nal input pins. Individual external interrupt or

Timer/Event Counter pins cannot be selected to have a

filter on/off function.

External Peripheral Interrupt

The External Peripheral Interrupt operates in a similar

way to the external interrupt and is contained within the

Multi-function interrupt.

For an external peripheral interrupt to occur, the global

interrupt enable bit, EMI, external peripheral interrupt

enable bit, EPI, and Multi-function interrupt enable bit,

EMFI, must first be set. An actual external peripheral in-

terrupt will take place when the external interrupt re-

quest flag, PEF, is set, a situation that will occur when a

negative transition, appears on the PINT pin. The exter-

F i l t e r O n / O f f

C o n f i g u r a t i o n O p t i o n

I N T C 1

F i l t e r

I N T C 0

F i l t e r

E x t e r n a l I N T . 0

E x t e r n a l I N T . 1

M C U

HT56R656 Datasheet(PDF) 72 Page - Holtek Semiconductor Inc

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