BS67F340 Datasheet, PDF (249/281 Pages) Holtek Semiconductor Inc – Enhanced Touch A/D Flash MCU with LCD Driver

BS67F340/BS67F350/BS67F360/BS67F370
Enhanced Touch A/D Flash MCU with LCD Driver
Touch Key Interrupt
For a Touch Key interrupt to occur, the global interrupt enable bit, EMI, and the Touch Key interrupt
enable TKME must be first set. An actual Touch Key interrupt will take place when the Touch Key
request flag, TKMF, is set, a situation that will occur when the time slot counter overflows. When
the interrupt is enabled, the stack is not full and the Touch Key time slot counter overflow occurs,
a subroutine call to the relevant touch key interrupt vector, will take place. When the interrupt is
serviced, the Touch Key interrupt request flag, TKMF, will be automatically reset and the EMI Bit
will be automatically cleared to disable other interrupts.
UART Transfer Interrupt
The UART Transfer Interrupt is controlled by several UART transfer conditions. When one of these
conditions occurs, an interrupt pulse will be generated to get the attention of the microcontroller.
These conditions are a transmitter data register empty, transmitter idle, receiver data available,
receiver overrun, address detect and an RX pin wake-up. To allow the program to branch to its
respective interrupt vector address, the global interrupt enable bit, EMI, and UART Interrupt
enable bit, URE, must first be set. When the interrupt is enabled, the stack is not full and any of the
conditions described above occurs, a subroutine call to the UART Interrupt vector, will take place.
When the interrupt is serviced, the UART Interrupt flag, URF, will be automatically cleared. The
EMI bit will also be automatically cleared to disable other interrupts.
A/D Converter Interrupt
The A/D Converter Interrupt is controlled by the termination of an A/D conversion process. An A/D
Converter Interrupt request will take place when the A/D Converter Interrupt request flag, ADF, is
set, which occurs when the A/D conversion process finishes. To allow the program to branch to its
respective interrupt vector address, the global interrupt enable bit, EMI, and A/D Interrupt enable bit,
ADE, must first be set. When the interrupt is enabled, the stack is not full and the A/D conversion
process has ended, a subroutine call to the A/D Converter Interrupt vector, will take place. When the
interrupt is serviced, the A/D Converter Interrupt flag, ADF, will be automatically cleared. The EMI
bit will also be automatically cleared to disable other interrupts.
Multi-function Interrupt
Within the devices there are up to four Multi-function interrupts. Unlike the other independent
interrupts, these interrupts have no independent source, but rather are formed from other existing
interrupt sources, namely the TM interrupts, LVD interrupt, EEPROM write operation interrupt and
SIM interface interrupts.
A Multi-function interrupt request will take place when any of the Multi-function interrupt request
flags MFnF are set. The Multi-function interrupt flags will be set when any of their included
functions generate an interrupt request flag. To allow the program to branch to its respective interrupt
vector address, when the Multi-function interrupt is enabled and the stack is not full, and either one
of the interrupts contained within each of Multi-function interrupt occurs, a subroutine call to one of
the Multi-function interrupt vectors will take place. When the interrupt is serviced, the related Multi-
Function request flag will be automatically reset and the EMI bit will be automatically cleared to
disable other interrupts.
However, it must be noted that, although the Multi-function Interrupt request flags will be
automatically reset when the interrupt is serviced, the request flags from the original source of
the Multi-function interrupts will not be automatically reset and must be manually reset by the
application program.
Rev. 1.40
249
December 15, 2016