HT82B60R datasheet(15/70 Pages) HOLTEK

15 / 70 page

HT82B60R

Rev. 1.10

February 1, 2011

will in fact only read the status of the output data latch

and not the actual logic status of the output pin.

Pin-shared Functions

The flexibility of the microcontroller range is greatly en-

hanced by the use of pins that have more than one func-

tion. Limited numbers of pins can force serious design

constraints on designers but by supplying pins with

multi-functions, many of these difficulties can be over-

come. For some pins, the chosen function of the

multi-function I/O pins is set by configuration options

while for others the function is set by application pro-

gram control.

· External Interrupt Input

The external interrupt pin, INT is pin-shared with the

I/O pin PB5. For applications not requiring an external

interrupt input, the pin-shared external interrupt pin

can be used as a normal I/O pin, however to do this,

the external interrupt enable bit in the INTC1 register

must be disabled.

· External Timer0 Clock Input

The external timer pin TMR0 is pin-shared with the I/O

pin PA6. To configure this pin to operate as timer input,

the corresponding control bits in the timer control reg-

ister must be correctly set. For applications that do not

require an external timer input, this pin can be used as

a normal I/O pin. Note that if used as a normal I/O pin

the timer mode control bits in the timer control register

must select the timer mode, which has an internal

clock source, to prevent the input pin from interfering

with the timer operation.

· External Timer1 Clock Input

The external timer pin TMR1 is pin-shared with the I/O

pin PA7. To configure this pin to operate as timer input,

the corresponding control bits in the timer control reg-

ister must be correctly set. For applications that do not

require an external timer input, this pin can be used as

a normal I/O pin. Note that if used as a normal I/O pin

the timer mode control bits in the timer control register

must select the timer mode, which has an internal

clock source, to prevent the input pin from interfering

with the timer operation.

External Interrupt Input

The external interrupt pin INT is pin-shared with the I/O

pin PB5. For applications not requiring an external inter-

rupt input, the pin-shared external interrupt pin can be

used as a normal I/O pin, however to do this, the exter-

nal interrupt enable bits in the INTC1 register must be

disabled.

COM Driver Pins

Pins PC0~PC3 on Port C can be used as LCD COM

driver pins. This function is controlled using the LCDC

nals on these four pins.

Serial Interface Module

The device pins, PB0~PB3, are pin-shared with pins

SDA, SCL, SCS, SCK, SDI, SDO. The choice of which

function is used is selected using the SIMCTL0 register.

I/O Pin Structures

The diagram illustrates a generic I/O pin internal struc-

tures. As the exact logical construction of the I/O pin will

differ and as the pin-shared structures are not illustrated

this diagram is supplied as a guide only to assist with the

functional understanding of the I/O pins.

Programming Considerations

Within the user program, one of the first things to con-

sider is port initialisation. After a reset, all of the data and

port control register will be set high. This means that all

I/O pins will default to an input state, the level of which

depends on the other connected circuitry and whether

pull-high options have been selected. If the PAC, PBC,

V D D / V 3 3 O ( P B )

W a k e - u p O p t i o n

S y s t e m W a k e - u p

R e a d D a t a R e g i s t e r

C K

C o n t r o l B i t

D a t a B u s

W r i t e C o n t r o l R e g i s t e r

C h i p R e s e t

R e a d C o n t r o l R e g i s t e r

W r i t e D a t a R e g i s t e r

D a t a B i t

I / O p i n

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P u l l - H i g h

O p t i o n

Input/Output Ports

HT82B60R Datasheet(PDF) 15 Page - Holtek Semiconductor Inc

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