HT66F016 datasheet(47/116 Pages) HOLTEK

47 / 116 page

HT66F016/HT66F017/HT68F016/HT68F017

Rev. 1.00

May 14, 2012

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. This function is especially suitable for

applications that can be woken up via external switches. Each pin on Port A can be selected individually to have this

wake-up feature using the PAWU register.

· PAWU Register

Bit

76543210

Name

R/W

POR

00000000

Bit 7~0

PAWU: Port A bit 7 ~ bit 0 wake-up control

0: disable

1: enable

I/O Port Control Register

The I/O port has its own control register known as PAC and PBC, to control the input/output configuration. With this

control register, each CMOS output or input can be reconfigured dynamically under software control. Each pin of the

I/O port is directly mapped to a bit in its associated port control register. For the I/O pin to function as an input, the corre-

sponding bit of the control register must be written as a

²1². This will then allow the logic state of the input pin to be di-

rectly read by instructions. When the corresponding bit of the control register is written as a

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.

· PAC Register

Bit

76543210

Name

R/W

POR

11111111

Bit 7~0

I/O Port A bit 7 ~ bit 0 input/output control

0: Output

1: Input

· PBC Register

Bit

76543210

Name

¾¾

R/W

¾¾

R/W

POR

¾¾

111111

Bit 7~6

²¾² Unimplemented, read as 0

Bit 5~0

I/O Port B bit 5 ~ bit 0 input/output control

0: Output

1: Input

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