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MC68HC908GR16A Datasheet(PDF) 96 Page - Freescale Semiconductor, Inc

No. de Pieza. MC68HC908GR16A
Descripción  M68HC08 Microcontrollers
Descarga  270 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC68HC908GR16A Datasheet(HTML) 96 Page - Freescale Semiconductor, Inc

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External Interrupt (IRQ)
MC68HC908GR16A Data Sheet, Rev. 1.0
96
Freescale Semiconductor
Figure 8-1. IRQ Module Block Diagram
When an interrupt pin is both falling-edge and low-level triggered (MODE = 1), the interrupt remains set
until both of these events occur:
Vector fetch or software clear
Return of the interrupt pin to a high level
The vector fetch or software clear may occur before or after the interrupt pin returns to a high level. As
long as the pin is low, the interrupt request remains pending. A reset will clear the latch and the MODE
control bit, thereby clearing the interrupt even if the pin stays low.
When set, the IMASK bit in the INTSCR masks all external interrupt requests. A latched interrupt request
is not presented to the interrupt priority logic unless the IMASK bit is clear.
NOTE
The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including external interrupt requests.
Addr.
Register Name
Bit 7
654321
Bit 0
$001D
IRQ Status and Control
Register (INTSCR)
See page 98.
Read:
0000
IRQF
0
IMASK
MODE
Write:
ACK
Reset:
00000000
= Unimplemented
Figure 8-2. IRQ I/O Register Summary
IMASK
DQ
CK
CLR
IRQ
HIGH
INTERRUPT
TO MODE
SELECT
LOGIC
REQUEST
VDD
MODE
VOLTAGE
DETECT
IRQF
TO CPU FOR
BIL/BIH
INSTRUCTIONS
VECTOR
FETCH
DECODER
RESET
VDD
INTERNAL
PULLUP
DEVICE
ACK
IRQ
SYNCHRONIZER


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