HT46R0664 datasheet(41/92 Pages) HOLTEK

41 / 92 page

Rev. 1.00

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Rev. 1.00

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HT46R0664

Enhanced A/D+LCD 8-Bit OTP MCU

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 “MOV A, [m]”, 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, 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 registers PAPU, PBPU, etc. and are implemented using weak

PMOS transistors.

Port A Wake-up

The HALT instruction forces the microcontroller into the SLEEP or IDLE Mode which preserves

power, 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

Port A pins from high to low. After a HALT instruction forces the microcontroller into entering the

Idle/Sleep 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 changes from high to low. This function is especially suitable for

applications that can be woken up via external switches. Note that pins PA0 to PA7 can be selected

individually to have this wake-up feature using an internal register known as PAWK, located in the

Data Memory.

Name

Bit

P�WK

P�WK7

P�WK6

P�WK5

P�WK4

P�WK3

P�WK�

P�WK1

P�WK0

P�PU

—

P�PU6

P�PU5

P�PU4

P�PU3

P�PU�

P�PU1

P�PU0

P�C

P�C7

P�C6

P�C5

P�C4

P�C3

P�C�

P�C1

P�C0

PBPU

PBPU7

PBPU6

PBPU5

PBPU4

PBPU3

PBPU�

PBPU1

PBPU0

PBC

PBC7

PBC6

PBC5

PBC4

PBC3

PBC�

PBC1

PBC0

PCPU

PCPU7

PCPU6

PCPU5

PCPU4

PCPU3

PCPU�

PCPU1

PCPU0

PCC

PCC7

PCC6

PCC5

PCC4

PCC3

PCC�

PCC1

PCC0

PDPU

PDPU7

PDPU6

PDPU5

PDPU4

PDPU3

PDPU�

PDPU1

PDPU0

PDC

PDC7

PDC6

PDC5

PDC4

PDC3

PDC�

PDC1

PDC0

PEPU

—

PEPU6

PEPU5

PEPU4

PEPU3

PEPU�

PEPU1

PEPU0

PEC

—

PEC6

PEC5

PEC4

PEC3

PEC�

PEC1

PEC0

PFPU

—

PFPU�

PFPU1

PFPU0

PFC

—

PFC�

PFC1

PFC0

“—”

Unimplemented, read as “0”

PAWKn: PA wake-up function control

0: disable

1: enable

PACn/PBCn/PCCn/PDCn/PECn/PFCn: I/O type selection

0: output

1: input

PAPUn/PBPUn/PCPUn/PDPUn/PEPUn/PFPUn: Pull-high function control

0: disable

1: enable

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