HT46R006 datasheet(31/72 Pages) HOLTEK

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HT48R006/HT46R006

Rev. 1.00

October 24, 2011

Input/Output Ports

Holtek microcontrollers offer considerable flexibility on

their I/O ports. Most pins can have either an input or out-

put designation under user program control. Addi-

tionally, as there are pull-high resistors and wake-up

software configurations, the user is provided with an I/O

structure to meet the needs of a wide range of applica-

tion possibilities.

For input operation, these ports are non-latching, which

means the inputs must be ready at the T2 rising edge of

instruction

²MOV A,[m]², where m denotes the port ad-

dress. For output operation, all the data is latched and

remains unchanged until the output latch is rewritten.

Pull-high Resistors

Many product applications require pull-high resistors for

their switch inputs usually requiring the use of an external

resistor. To eliminate the need for these external resis-

tors, when configured as an input have the capability of

being connected to an internal pull-high resistor. These

pull-high resistors are selectable via a register known as

PAPU located in the Data Memory. The pull-high resis-

tors are implemented using weak PMOS transistors.

Note that pin PA7 does not have a pull-high resistor se-

lection.

Port A Wake-up

If the HALT instruction is executed, the device will enter

the Sleep Mode, where the system clock will stop result-

ing in power being conserved, a feature that is important

for battery and other low-power applications. Various

methods exist to wake-up the microcontroller, one of

which is to change the logic condition on one of the

PA0~PA2, PA5~PA7 pins from high to low. After a HALT

instruction forces the microcontroller into entering the

Sleep Mode, the processor will remain in a low-power

state until the logic condition of the selected wake-up pin

on Port A changes from high to low. This function is es-

pecially suitable for applications that can be woken up

via external switches. Note that pins PA0~PA2,

PA5~PA7 can be selected individually to have this

wake-up feature using an internal register known as

PAWK, located in the Data Memory.

· PAWK, PAC, PAPU Register

Name

POR

Bit

76543210

PAWK

00H

PAWK7

PAWK6

PAWK5

¾¾

PAWK2

PAWK1

PAWK0

PAC

E7H

PAC7

PAC6

PAC5

¾¾

PAC2

PAC1

PAC0

PAPU

00H

PAPU6

PAPU5

¾¾

PAPU2

PAPU1

PAPU0

²¾² Unimplemented, read as ²0²

PAWKn: PA wake-up function enable

0: disable

1: enable

PACn: I/O type selection

0: output

1: input

PAPUn: Pull-high function enable

0: disable

1: enable

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