Rev. 1.71
108
April 11, 2017
Rev. 1.71
109
April 11, 2017
HT66F002/HT66F0025/HT66F003/HT66F004
Cost-Effective A/D Flash MCU with EEPROM
HT66F002/HT66F0025/HT66F003/HT66F004
Cost-Effective A/D Flash MCU with EEPROM
Interrupts
Interrupts are an important part of any microcontroller system. When an external event or an
internal function such as a Timer Module or an A/D converter requires microcontroller attention,
their corresponding interrupt will enforce a temporary suspension of the main program allowing the
microcontroller to direct attention to their respective needs. The devices contain several external
interrupts and internal interrupts functions. The external interrupts are generated by the action of
the external INT0~INT1 and INT pin, while the internal interrupts are generated by various internal
functions such as the TMs, Time Base, EEPROM and the A/D converter.
Interrupt Registers
Overall interrupt control, which basically means the setting of request flags when certain
microcontroller conditions occur and the setting of interrupt enable bits by the application program,
is controlled by a series of registers, located in the Special Purpose Data Memory, as shown in the
accompanying table. The number of registers depends upon the device chosen but fall into three
categories. The first is the INTC0~INTC
1
registers which setup the primary interrupts, the second
is the MFI0~MFI
1
registers which setup the Multi-function interrupts. Finally there is an INTEG
register to setup the external interrupt trigger edge type.
Each register contains a number of enable bits to enable or disable individual registers as well as
interrupt flags to indicate the presence of an interrupt request. The naming convention of these
follows a specific pattern. First is listed an abbreviated interrupt type, then the (optional) number of
that interrupt followed by either an “E” for enable/disable bit or “F” for request flag.
Function
Enable Bit
Request Flag
Notes
Global
EMI
—
—
INT Pin
INTE
INTF
—
A/D Converter
ADE
ADF
—
Multi-function
MF0E
MF0F
—
Time Base
TBnE
TBnF
n=0 or 1
EEPROM
DEE
DEF
—
TM
STMA0E
STMA0F
—
STMP0E
STMP0F
Interrupt Register Bit Naming Conventions – HT66F002/HT66F0025
Function
Enable Bit
Request Flag
Notes
Global
EMI
—
—
INT Pin
INTE
INTF
—
A/D Converter
ADE
ADF
—
Multi-function
MFnE
MFnF
n=0 or 1
Time Base
TBnE
TBnF
n=0 or 1
EEPROM
DEE
DEF
—
TM
STMA0E
STMA0F
—
STMP0E
STMP0F
PTMA1E
PTMA1F
PTMP1E
PTMP1F
Interrupt Register Bit Naming Conventions – HT66F003