HT46R0664 datasheet(43/92 Pages) HOLTEK

43 / 92 page

Rev. 1.00

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HT46R0664

Enhanced A/D+LCD 8-Bit OTP MCU

● A/D Inputs

The device has 12 inputs to the A/D converter. All of these analog inputs are pin-shared with I/O

pins. If these pins are to be used as A/D inputs and not as I/O pins then the corresponding PCRn

bits in the A/D converter control registers, ANCSR0/ANCSR1, must be properly setup. There

are no configuration options associated with the A/D converter. If chosen as I/O pins, then full

pull-high resistor configuration options remain, however if used as A/D inputs then any pull-high

resistor configuration options associated with these pins will be automatically disconnected.

Pin Remapping Configuration

The pin remapping function enables the function pins TC0 and TC1 to be located on different port

pins. It is important not to confuse the Pin Remapping function with the Pin-shared function, the two

functions have no interdependence. The PCFG bit in the CTRL0 register allows the two function

pins TC0 and TC1 to be remapped to different port pins. After power up, this bit will be reset to

zero, which will define the default port pins to which the two functions will be mapped. Changing

this bit will move the functions to other port pins.

Examination of the pin names on the package diagrams will reveal that some pin function names

are repeated, this indicates a function pin that can be remapped to other port pins. If the pin name is

bracketed then this indicates its alternative location. Pin names without brackets indicate its default

location which is the condition after Power-on.

PCFG Bit Status

PCFG Bit

Pin Mappin�

TC1/P�1

TC0/P��

TC0/P�1

TC1/P��

I/O Pin Structures

The accompanying diagrams illustrate the internal structures of some generic I/O pin types. As

the exact logical construction of the I/O pin will differ from these drawings, they are supplied as a

guide only to assist with the functional understanding of the I/O pins. The wide range of pin-shared

structures does not permit all types to be shown.

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Generic Input/Output Ports

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