Rev. 1.00
96
August 29, 2018
Rev. 1.00
97
August 29, 2018
HT45F6530
AC Voltage Regulator Flash MCU
HT45F6530
AC Voltage Regulator Flash MCU
automatically cleared to disable other interrupts. Note that any pull-high resistor selections on the
external interrupt pins will remain valid even if the pin is used as an external interrupt input.
The INTEG register is used to select the type of active edge that will trigger the external interrupt.
A choice of either rising or falling or both edge types can be chosen to trigger an external interrupt.
Note that the INTEG register can also be used to disable the external interrupt function.
Multi-function Interrupts
Within the device there are up to two 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.
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, the global interrupt enable bit, EMI, and the multi-function interrupt enable bit,
MFnE, must first be set. 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 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.
Time Base Interrupts
The function of the Time Base Interrupts is to provide regular time signal in the form of an internal
interrupt. They are controlled by the overflow signals from their respective timer functions. When
these happens their respective interrupt request flags, TB0F or TB1F will be set. To allow the
program to branch to their respective interrupt vector addresses, the global interrupt enable bit, EMI
and Time Base enable bits, TB0E or TB1E, must first be set. When the interrupt is enabled, the stack
is not full and the Time Base overflows, a subroutine call to their respective vector locations will
take place. When the interrupt is serviced, the respective interrupt request flag, TB0F or TB1F, will
be automatically reset and the EMI bit will be cleared to disable other interrupts.
The purpose of the Time Base Interrupt is to provide an interrupt signal at fixed time periods. Its
clock source, f
PSC
, originates from the internal clock source f
SYS
, f
SYS
/4 or f
SUB
and then passes
through a divider, the division ratio of which is selected by programming the appropriate bits in the
TB0C and TB1C registers to obtain longer interrupt periods whose value ranges. The clock source
which in turn controls the Time Base interrupt period is selected using the CLKSEL1~CLKSEL0
bits in the PSCR register.
M
U
X
f
SYS
/4
f
SYS
f
SUB
Prescaler
CLKSEL[1:0]
f
PSC
f
PSC
/2
8
~ f
PSC
/2
15
M
U
X
M
U
X
TB0[2:0]
TB1[2:0]
Time Base 0 Interrupt
Time Base 1 Interrupt
TB0ON
TB1ON
f
PSC
/2
8
~ f
PSC
/2
15
Time Base Interrupts
