HT46R006 datasheet(32/72 Pages) HOLTEK

32 / 72 page

HT48R006/HT46R006

Rev. 1.00

October 24, 2011

I/O Port Control Registers

Each Port has its own control register, known as PAC

which controls the input/output configuration. With this

control register, each I/O pin with or without pull-high re-

sistors can be reconfigured dynamically under software

control. For the I/O pin to function as an input, the corre-

sponding bit of the control register must be written as a

²1². This will then allow the logic state of the input pin to

be directly read by instructions. When the correspond-

ing bit of the control register is written as a

²0², the I/O

pin will be setup as a CMOS output. If the pin is currently

setup as an output, instructions can still be used to read

the output register. However, it should be noted that the

program 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 an

I/O pin. To use the pin as an external interrupt input

the correct bits in the INTC0 register must be pro-

grammed. The pin must also be setup as an input by

setting bit in the Port Control Register. A pull-high re-

sistor can also be selected via the appropriate port

pull-high resistor register. Note that even if the pin is

setup as an external interrupt input the I/O function

still remains.

· External Timer/Event Counter Input

The Timer/Event Counter pins, TC0 and TC1 are

pin-shared with I/O pins. For these shared pins to be

used as Timer/Event Counter inputs, the Timer/Event

Counter must be configured to be in the Event Coun-

ter or Pulse Width Capture Mode. This is achieved by

setting the appropriate bits in the Timer/Event Counter

Control Register. The pins must also be setup as in-

puts by setting the appropriate bit in the Port Control

lected using the port pull-high resistor registers. Note

that even if the pin is setup as an external timer input

the I/O function still remains.

· PFD Output -- HT46R006

The PFD function output is pin-shared with an I/O pin.

The output function of this pin is chosen using the

CTRL0 register. Note that the corresponding bit of

the port control register, must setup the pin as an

output to enable the PFD output. If the port control

function as a normal logic input with the usual

pull-high selection, even if the PFD function has been

selected.

· Buzzer Output -- HT48R006

The device contains a Buzzer function whose single

or dual outputs are pin-shared with I/O pins. The out-

put function of these pin are chosen using the CTRL0

control register, must setup the pin as an output to en-

able the BZ, BZ output. If the port control register has

setup these pins as input, then these pins will function

as normal logic input with the usual pull-high selec-

tion, even if the Buzzer function has been selected.

· PWM Outputs

The PWM function whose outputs are pin-shared with

I/O pins. The PWM output functions are chosen using

the CTRL0 register. Note that the corresponding bit of

the port control registers, for the output pin, must

setup the pin as an output to enable the PWM output.

If the pins are setup as inputs, then the pin will function

as a normal logic input with the usual pull-high selec-

tions, even if the PWM registers have enabled the

PWM function.

· A/D Inputs

All of these analog inputs are pin-shared with I/O pins.

If these pins are to be used as A/D inputs and not as

I/O pins then the corresponding PCRn bits in the A/D

converter control register, ADCR, must be properly

setup. There are no configuration options associated

with the A/D converter. If chosen as I/O pins, then full

pull-high resistor configuration options remain, how-

ever if used as A/D inputs then any pull-high resistor

options associated with these pins will be automati-

cally disconnected.

HT46R006 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc

HT46R006 Datasheet(HTML) 32 Page - Holtek Semiconductor Inc

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