HT45F43 datasheet(58/152 Pages) HOLTEK

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PAPU Register

Bit

76543210

Name

R/W

POR

00000000

Bit 7~0

I/O Port bit 7 ~ bit 0 Pull-High Control

0: Disable

1: Enable

PBPU, PCPU Register

Bit

76543210

Name

R/W

POR

0000000

Bit 7

²¾² Unimplemented, read as ²0²

Bit 6~0

I/O Port bit 6 ~ bit 0 Pull-High Control

0: Disable

1: Enable

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 Registers

Each I/O port has its own control register known as PAC~PCC, 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 ports is directly mapped to a bit in its associated port

control register. 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 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.

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

HT45F43 Datasheet(PDF) 58 Page - Holtek Semiconductor Inc

HT45F43 Datasheet(HTML) 58 Page - Holtek Semiconductor Inc

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