HT82R732 datasheet(32/74 Pages) HOLTEK

32 / 74 page

Input/Output Ports

Holtek microcontrollers offer considerable flexibility on their I/O ports. Most pins can have either an

input or output designation under user program control. Additionally, 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 application 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 address. 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 resistors, 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, PBPU and PCPU located in the Data Memory. The pull-high

resistors are implemented using weak PMOS transistors.

Port Wake-up

If the HALT instruction is executed, the device will enter the HALT Mode, where the system clock will

stop resulting 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~PA7 (or PB0~PB7 or PC1~PC2) pins from high to low. After a HALT

instruction forces the microcontroller into entering the HALT Mode, the processor will remain idle or

in a low-power state until the logic condition of the selected wake-up pin on Port A (or Port B or Port

C) changes from high to low. This function is especially suitable for applications that can be woken up

via external switches. Note that pins of the PA, PB and PC can be selected individually to have this

wake-up feature using internal registers known as PAWK, PBWK and PCWK, located in the Data

Memory.

PAWK, PAC, PAPU, PBWK, PBC, PBPU, PCWK, PCC, PCPU Registers

Name

POR

Bit

76543210

PAWK

00H

PAWK7

PAWK6

PAWK5

PAWK4

PAWK3

PAWK2

PAWK1

PAWK0

PAC

FFH

PAC7

PAC6

PAC5

PAC4

PAC3

PAC2

PAC1

PAC0

PAPU

00H

PAPU7

PAPU6

PAPU5

PAPU4

PAPU3

PAPU2

PAPU1

PAPU0

PBWK

00H

PBWK7

PBWK6

PBWK5

PBWK4

PBWK3

PBWK2

PBWK1

PBWK0

PBC

3FH

PBC7

PBC6

PBC5

PBC4

PBC3

PBC2

PBC1

PBC0

PBPU

00H

PBPU7

PBPU6

PBPU5

PBPU4

PBPU3

PBPU2

PBPU1

PBPU0

PCWK

00H

¾¾¾¾¾

PCWK2

PCWK1

PCC

FFH

¾¾¾¾¾

PCC2

PCC1

PCPU

00H

¾¾¾¾¾

PCPU2

PCPU1

²¾² Unimplemented, read as ²0²

PAWKn/PBWKn/PCWKn: PA, PB, PC wake-up function enable

0: disable

1: enable

PACn/PBCn/PCCn: I/O type selection

0: output

1: input

Rev. 1.00

October 31, 2013

HT82R732

e-Banking 8-Bit OTP MCU

HT82R732 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc

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