HT66F24D View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT66F24D' PDF : 177 Pages View PDF
A/D Flash Type 8-bit MCU with EEPROM
HT66F24D/HT66F25D
Pin-remapping Functions
The flexibility of the microcontroller range is greatly enhanced by the use of pins that have more
than one function. Limited numbers of pins can force serious design constraints on designers but
by supplying pins with multi-functions, many of these difficulties can be overcome. The way in
which the pin function of each pin is selected is different for each function and a priority order is
established where more than one pin function is selected simultaneously. Additionally there is a
PRM0 register to establish certain pin functions.
Pin-remapping Registers
The limited number of supplied pins in a package can impose restrictions on the amount of functions
a certain device can contain. However by allowing the same pins to share several different functions
and providing a means of function selection, a wide range of different functions can be incorporated
into even relatively small package sizes. The devices include a PRM0 register which can select the
functions of certain pins.
PRM0 Register
Bit
7
6
5
4
3
2
1
0
HT66F24D
HT66F25D
INT1PS
INT0PS TCK1PS TCK0PS
—
—
—
—
Pin-remapping Register List
HT66F24D/HT66F25D
Bit
7
6
5
4
3
2
1
0
Name INT1PS INT0PS TCK1PS TCK0PS
—
—
—
—
R/W
R/W
R/W
R/W
R/W
—
—
—
—
POR
0
0
0
0
—
—
—
—
Bit 7
Bit 6
Bit 5
Bit 5
Bit 4
Bit 3~0
INT1PS: INT1 Pin Remapping Control
0: INT1 on PB0
1: INT1 on PC1
INT0PS: INT0 Pin Remapping Control
0: INT1 on PA2
1: INT1 on PC0
TCK1PS: TCK1 Pin Remapping Control
0: TCK1 on PB0
1: TCK1 on PC3
“—” Unimplemented, read as 0
TCK0PS: TCK0 Pin Remapping Control
0: TCK0 on PA6
1: TCK0 on PC2
“—” Unimplemented, read as 0
Rev. 1.10
64
March 25, 2013
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