HT66F016 datasheet(46/116 Pages) HOLTEK

46 / 116 page

HT66F016/HT66F017/HT68F016/HT68F017

Rev. 1.00

May 14, 2012

Input/Output Ports

Holtek microcontrollers offer considerable flexibility on their I/O ports. With the input or output designation of every pin

fully under user program control, pull-high selections for all ports and wake-up selections on certain pins, the user is

provided with an I/O structure to meet the needs of a wide range of application possibilities.

The device provides bidirectional input/output lines labeled with port names PA and PB. These I/O ports are mapped to

the RAM Data Memory with specific addresses as shown in the Special Purpose Data Memory table. All of these I/O

ports can be used for input and output operations. 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 address. For output

operation, all the data is latched and remains unchanged until the output latch is rewritten.

· I/O Register List

Name

Bit

76543210

PAC

PAPU

PAWU

¾¾

PBC

¾¾

PBPU

¾¾

PRM

PRML3

PRML2

PRML1

PRML0

PRMS3

PRMS2

PRMS1

PRMS0

Pull-High Resistors

Many product applications require pull-high resistors for their switch inputs usually requiring the use of an external re-

sistor. To eliminate the need for these external resistors, all I/O pins, when configured as an input have the capability of

being connected to an internal pull-high resistor. These pull-high resistors are selected using the register PAPU and

PBPU, and are implemented using weak PMOS transistors.

· PAPU Register

Bit

76543210

Name

R/W

POR

00000000

Bit 7~0

I/O Port A bit 7 ~ bit 0 Pull-high control

0: disable

1: enable

· PBPU Register

Bit

76543210

Name

¾¾

R/W

¾¾

R/W

POR

¾¾

000000

Bit 7~6

²¾² Unimplemented, read as 0

Bit 5~0

I/O Port B bit 5 ~ bit 0 Pull-high control

0: disable

1: enable

HT66F016 Datasheet(PDF) 46 Page - Holtek Semiconductor Inc

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