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HT56R22 Datasheet(PDF) 86 Page - Holtek Semiconductor Inc

No. de pieza HT56R22
Descripción Electrónicos  TinyPowerTM A/D Type 8-Bit OTP MCU with DAC
Download  127 Pages
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Fabricante Electrónico  HOLTEK [Holtek Semiconductor Inc]
Página de inicio  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56R22 Datasheet(HTML) 86 Page - Holtek Semiconductor Inc

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HT56R22/HT56R23/HT56R24/HT56R25/HT56R26
Rev. 1.30
86
December 26, 2014
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 routine, to al-
low interrupt nesting. If the stack is full, the interrupt re-
quest will not be acknowledged, even if the related
interrupt is enabled, until the Stack Pointer is decre-
mented. If immediate service is desired, the stack must
be prevented from becoming full. In case of simulta-
neous requests, the accompanying diagram shows the
priority that is applied. All of the interrupt request flags
when set will wake-up the device if it is in SLEEP or
IDLE Mode, however to prevent a wake-up from occur-
ring the corresponding flag should be set before the de-
vice is in SLEEP or IDLE Mode.
External Interrupt
For an external interrupt to occur, the global interrupt en-
able bit, EMI, and external interrupt enable bits, INT0E
and INT1E, must first be set. Additionally the correct in-
terrupt edge type must be selected using the INTEDGE
register to enable the external interrupt function and to
choose the trigger edge type. An actual external inter-
rupt will take place when the external interrupt request
flag, INT0F or INT1F, is set, a situation that will occur
when a transition, whose type is chosen by the edge se-
lect bit, appears on the INT0 or INT1 pin. The external
interrupt pins are pin-shared with the I/O pins PA4 and
PA6 and can only be configured as external interrupt
pins if their corresponding external interrupt enable bit in
the INTC0 register has been set. The pin must also be
setup as an input by setting the corresponding PAC.4
and PAC.6 bits in the port control register. When the in-
terrupt is enabled, the stack is not full and the correct
transition type appears on the external interrupt pin, a
subroutine call to the external interrupt vector at location
04H or 08H, will take place. When the interrupt is ser-
viced, the external interrupt request flags, INT0F or
INT1F, will be automatically reset and the EMI bit will be
automatically cleared to disable other interrupts. Note
that any pull-high resistor selections on this pin will re-
main valid even if the pin is used as an external interrupt
input.
The INTEDGE register is used to select the type of active
edge that will trigger the external interrupt. A choice of ei-
ther rising and falling edge types can be chosen along
with an option to allow both edge types to trigger an ex-
ternal interrupt. Note that the INTEDGE register can also
be used to disable the external interrupt function.
· INTEDGE Register - All Devices
Bit
76543210
Name
¾¾¾¾
INT1S1
INT1S0
INT0S1
INT0S0
R/W
¾¾¾¾
R/W
R/W
R/W
R/W
POR
¾¾¾¾
0000
Bit 7~4
unimplemented, read as
²0²
Bit 3~2
INT1S1, INT1S0: interrupt edge control for INT1 pin
00: disable
01: rising edge
10: falling edge
11: rising and falling edges
Bit 1~0
INT0S1, INT0S0: interrupt edge control for INT0 pin
00: disable
01: rising edge
10: falling edge
11: rising and falling edges


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