Configuration Option; Application Circuit - Holtek HT66F488 Manual

HT66F488/HT66F489
A/D Flash MCU with EEPROM

Configuration Option

Configuration options refer to certain options within the MCU that are programmed into the device
during the programming process. During the development process, these options are selected using
the HT-IDE software development tools. As these options are programmed into the device using
the hardware programming tools, once they are selected they cannot be changed later using the
application program. All options must be defined for proper system function, the details of which are
shown in the table.
No.
Oscillator Option
1

Application Circuit

Rev. 1.21
High Speed/Low Speed Syste� Oscillato� Selection – f
HIRC+LIRC
HIRC+LXT
HXT+LIRC
V
D D
V D D
0 . 1 m F
V S S
O S C 1
O S C
C i r c u i t
O S C 2
X T 1
O S C
C i r c u i t
X T 2
16�
Options
:
OSC
P A 0 ~ P A 7
P B 0 ~ P B 7
P C 0 ~ P C 7
P D 0 ~ P D 5
A N 0 ~ A N 7
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