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HT56R22 Datasheet(PDF) 83 Page - Holtek Semiconductor Inc

Part # HT56R22
Description  TinyPowerTM A/D Type 8-Bit OTP MCU with DAC
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56R22 Datasheet(HTML) 83 Page - Holtek Semiconductor Inc

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HT56R22/HT56R23/HT56R24/HT56R25/HT56R26
Rev. 1.30
83
December 26, 2014
Interrupts
Interrupts are an important part of any microcontroller
system. When an external event or an internal function
such as a Timer/Event Counter or Time Base requires
microcontroller attention, their corresponding interrupt
will enforce a temporary suspension of the main pro-
gram allowing the microcontroller to direct attention to
their respective needs.
The devices contain a single external interrupt and mul-
tiple internal interrupts.
Interrupt Register
Overall interrupt control, which means interrupt en-
abling and request flag setting, is controlled by using
several registers, INTC0, INTC1, MFIC0 and MFIC1. By
controlling the appropriate enable bits in this registers
each individual interrupt can be enabled or disabled.
Also when an interrupt occurs, the corresponding re-
quest flag will be set by the microcontroller. The global
enable flag if cleared to zero will disable all interrupts.
Interrupt Operation
A range of internal and external events can all generate
an interrupt, by setting their correspponding request
flag, if their appropriate interrupt enable bit is set. When
this happens, the Program Counter, which stores the
address of the next instruction to be executed, will be
transferred onto the stack. The Program Counter will
then be loaded with a new address which will be the
value of the corresponding interrupt vector. The
microcontroller will then fetch its next instruction from
this interrupt vector. The instruction at this vector will
usually be a JMP statement which will jump to another
section of program which is known as the interrupt ser-
vice routine. Here is located the code to control the ap-
propriate interrupt. The interrupt service routine must be
terminated with a RETI instruction, which retrieves the
original Program Counter address from the stack and al-
lows the microcontroller to continue with normal execu-
tion at the point where the interrupt occurred.
The various interrupt enable bits, together with their as-
sociated request flags, are shown in the following dia-
gram with their order of priority.
Once an interrupt subroutine is serviced, all the other in-
terrupts will be blocked, as the EMI bit will be cleared au-
tomatically. This will prevent any further interrupt
nesting from occurring. However, if other interrupt re-
quests occur during this interval, although the interrupt
will not be immediately serviced, the request flag will still
be recorded. If an interrupt requires immediate servicing
while the program is already in another interrupt service
routine, the EMI bit should be set after entering the rou-
tine, to allow interrupt nesting. If the stack is full, the in-
terrupt request will not be acknowledged, even if the
related interrupt is enabled, until the Stack Pointer is
decremented. If immediate service is desired, the stack
must be prevented from becoming full.
When an interrupt request is generated it takes 2 or 3 in-
struction cycle before the program jumps to the interrupt
vector. If the device is in the Sleep or Idle Mode and is
woken up by an interrupt request then it will take 3 cy-
cles before the program jumps to the interrupt vector.
Wait for 2 ~ 3 Instruction Cycles
Main
Program
ISR Entry
Enable Bit Set ?
Main
Program
RETI
(it will set EMI automatically)
Automatically Disable Interrupt
Clear EMI & Request Flag
Interrupt Request or
Interrupt Flag Set by Instruction
Y
N
Interrupt Flow


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