326
CHAPTER 19 INTERRUPT PIN SELECTION CIRCUIT
19.6
Precautions when Using Interrupt Pin Selection Circuit
This section explains the precautions to be taken when using the interrupt pin selection
circuit.
•
WICR (interrupt pin control register) is initialized to "40
H
" after a reset. This selects the INT00 bit only
as an interrupt pin. If using pins other than the INT00 pin as external interrupt pins, update the value of
this register before enabling the operation of the external interrupt circuit.
•
If more than one interrupt pin are selected in WICR (interrupt pin selection circuit control register)
simultaneously and the operation of INT00 (channel 0) of the external interrupt circuit is enabled (Set
the SL01 and SL00 bits of the EIC00 register to any value other than "00
B
" in the external interrupt
circuit to select the valid edge. Also write "1" to the EIE0 bit to enable interrupts.), the selected pins will
remain enabled to perform input so as to accept interrupts even in a standby mode.
•
If more than one interrupt pin are selected in WICR (interrupt pin selection circuit control register)
simultaneously, an input to INT00 (channel 0) of the external interrupt circuit is treated as "H" if any of
the selected input signals is "H". (It becomes "OR" of the signals inputted to the selected pins.)
Содержание F2 MC-8FX Family
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Страница 30: ...16 CHAPTER 1 DESCRIPTION 1 FPT 64P M23 FPT 64P M24 2 For the I O circuit type refer to 1 8 I O Circuit Type ...
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Страница 35: ...21 CHAPTER 2 HANDLING DEVICES This chapter gives notes on using 2 1 Device Handling Precautions ...
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Страница 39: ...25 CHAPTER 3 MEMORY SPACE This chapter describes memory space 3 1 Memory Space 3 2 Memory Map ...
Страница 43: ...29 CHAPTER 4 MEMORY ACCESS MODE This chapter describes the memory access mode 4 1 Memory Access Mode ...
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Страница 104: ...90 CHAPTER 7 RESET ...
Страница 105: ...91 CHAPTER 8 INTERRUPTS This chapter explains the interrupts 8 1 Interrupts ...
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Страница 482: ...468 CHAPTER 25 LOW VOLTAGE DETECTION RESET CIRCUIT ...
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Страница 564: ...550 CHAPTER 29 EXAMPLE OF SERIAL PROGRAMMING CONNECTION ...
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