HT46R065 datasheet(39/101 Pages) HOLTEK

39 / 101 page

HT46R064/065/066/0662/067

Rev. 1.30

January 22, 2013

¨ HT46R0662/HT46R067

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

FFH

PBC7

PBC6

PBC5

PBC4

PBC3

PBC2

PBC1

PBC0

PBPU

00H

PBPU7

PBPU6

PBPU5

PBPU4

PBPU3

PBPU2

PBPU1

PBPU0

PCC

FFH

PCC7

PCC6

PCC5

PCC4

PCC3

PCC2

PCC1

PCC0

PCPU

00H

PCPU7

PCPU6

PCPU5

PCPU4

PCPU3

PCPU2

PCPU1

PCPU0

PDC

FFH

PDC7

PDC6

PDC5

PDC4

PDC3

PDC2

PDC1

PDC0

PDPU

00H

PDPU7

PDPU6

PDPU5

PDPU4

PDPU3

PDPU2

PDPU1

PDPU0

PEC

FFH

PEC7

PEC6

PEC5

PEC4

PEC3

PEC2

PEC1

PEC0

PEPU

00H

PEPU7

PEPU6

PEPU5

PEPU4

PEPU3

PEPU2

PEPU1

PEPU0

PFC

03H

¾¾¾¾¾¾

PFC1

PFC0

PFPU

00H

¾¾¾¾¾¾

PFPU1

PFPU0

²¾² Unimplemented, read as ²0²

PAWKn: PA wake-up function enable

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 enable

0: disable

1: enable

I/O Port Control Registers

Each Port has its own control register, known as PAC,

PBC, PCC, PDC, PEC, PFC which controls the in-

put/output configuration. With this control register, each

I/O pin with or without pull-high resistors can be recon-

figured dynamically under software control. For the I/O

pin to function as an input, the corresponding bit of the

control register must be written as a

²1². This will then

allow the logic state of the input pin to be directly read by

instructions. When the corresponding bit of the control

²0², the I/O pin will be setup as a

CMOS output. If the pin is currently setup as an output,

instructions can still be used to read the output register.

However, it should be noted that the program will in fact

only read the status of the output data latch and not the

actual logic status of the output pin.

Pin-shared Functions

The flexibility of the microcontroller range is greatly en-

hanced by the use of pins that have more than one func-

tion. Limited numbers of pins can force serious design

constraints on designers but by supplying pins with

multi-functions, many of these difficulties can be over-

come. For some pins, the chosen function of the

multi-function I/O pins is set by configuration options

while for others the function is set by application pro-

gram control.

· External Interrupt Input

The external interrupt pin, INT, is pin-shared with an

I/O pin. To use the pin as an external interrupt input

the correct bits in the INTC0 register must be pro-

grammed. The pin must also be setup as an input by

setting the PAC3 bit in the Port Control Register. A

pull-high resistor can also be selected via the appro-

priate port pull-high resistor register. Note that even if

the pin is setup as an external interrupt input the I/O

function still remains.

· External Timer/Event Counter Input

The Timer/Event Counter pins, TC0, TC1 and TC2 are

pin-shared with I/O pins. For these shared pins to be

used as Timer/Event Counter inputs, the Timer/Event

Counter must be configured to be in the Event Coun-

ter or Pulse Width Capture Mode. This is achieved by

setting the appropriate bits in the Timer/Event Counter

Control Register. The pins must also be setup as in-

puts by setting the appropriate bit in the Port Control

lected using the port pull-high resistor registers. Note

that even if the pin is setup as an external timer input

the I/O function still remains.

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