HT48R065 datasheet(35/94 Pages) HOLTEK

35 / 94 page

HT48R063/064/065/066/0662/067

Rev. 1.30

June 11, 2010

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, PBPU, PCPU, PDPU, PEPU and PFPU located in

the Data Memory. The pull-high resistors are imple-

mented using weak PMOS transistors. Note that pin PA7

does not have a pull-high resistor selection.

Port A Wake-up

If the HALT instruction is executed, the device will enter

the Idle/Sleep Mode, where the system clock will stop

resulting in power being conserved, a feature that is im-

portant 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 pins from high to low. After a HALT instruc-

tion 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, lo-

cated in the Data Memory.

· PAWK, PAC, PAPU, PBC, PBPU, PCC, PCPU, PDC, PDPU, PEC, PEPU, PFC, PFPU Register

¨ HT48R063

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

PAPU6

PAPU5

PAPU4

PAPU3

PAPU2

PAPU1

PAPU0

PBC

3FH

¾¾

PBC5

PBC4

PBC3

PBC2

PBC1

PBC0

PBPU

00H

¾¾

PBPU5

PBPU4

PBPU3

PBPU2

PBPU1

PBPU0

²¾² Unimplemented, read as ²0²

PAWKn: PA wake-up function enable

0: disable

1: enable

PACn/PBCn: I/O type selection

0: output

1: input

PAPUn/PBPUn: Pull-high function enable

0: disable

1: enable

HT48R065 Datasheet(PDF) 35 Page - Holtek Semiconductor Inc

HT48R065 Datasheet(HTML) 35 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94

Datasheet Download

Link URL