HT68F04 Holtek Semiconductor, HT68F04 Datasheet - Page 51

• Manufacturer Part Number: HT68F04
• Description: Small Package Enhanced Flash Type 8-Bit MCU
• Manufacturer: Holtek Semiconductor

The power-on reset condition of the A/D converter con-
trol registers ensures that any A/D input pins - which are
always shared with other I/O functions - will be setup as
analog inputs after a reset. Although these pins will be
configured as A/D inputs after a reset, the A/D converter
will not be switched on. It is therefore important to note
that if it is required to use these pins as I/O digital input
pins or as other functions, the A/D converter control reg-
isters must be correctly programmed to remove the A/D
function. Note also that as the A/D channel is enabled,
any internal pull-high resistor connections will be re-
moved.
Rev. 1.00
Generic Input/Output Structure
A/D Input/Output Structure
HT66F03/HT66F04/HT68F03/HT68F04
51
Port A has the additional capability of providing wake-up
functions. When the device is in the SLEEP or IDLE
Mode, various methods are available to wake the device
up. One of these is a high to low transition of any of the
Port A pins. Single or multiple pins on Port A can be
setup to have this function.
April 16, 2010
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