Fujitsu F2MC-8L MB89620 Series Hardware Manual page 258

Table 12.3.1 External Interrupt Control Register 1 (EIC1) Bits
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
MB89620 series
Bit
• This bit is set to "1" when the edge selected by the edge polarity selection bit 1
(SEL1) is input to an external interrupt pin (INT1).
EIR1:
• An interrupt request is output when both this bit and interrupt request enable bit
External interrupt
1 (EIE1) are "1".
request flag bit 1
• Writing "0" clears this bit. Writing "1" has no effect and does not change the bit
value.
• The read value is indeterminate.
Unused bit
• Writing to this bit has no effect on the operation.
SEL1: • This bit selects the edge polarity that triggers interrupts when detected on
Edge polarity pulses input to external interrupt pin (INT1).
selection bit 1 • A value of "0" selects rising edges and "1" selects falling edges.
EIE1: This bit enables or disables an interrupt request output to the CPU. An interrupt
Interrupt request request is output when both this bit and the external interrupt request flag bit 1
enable bit 1 (EIR1) are "1".
• This bit is set to "1" when the edge selected by the edge polarity selection bit 0
(SEL0) is input to an external interrupt pin (INT0).
EIR0:
• An interrupt request is output when both this bit and the interrupt request enable
External interrupt
bit 0 (EIE0) are "1".
request flag bit 0
• Writing "0" clears this bit. Writing "1" has no effect and does not change the bit
value.
• The read value is indeterminate.
Unused bit
• Writing to this bit has no effect on the operation.
SEL0: • This bit selects the edge polarity that triggers interrupts when detected on
Edge polarity pulses input to external interrupt pin (INT0).
selection bit 0 • A value of "0" selects rising edges and "1" selects falling edges.
EIE0: This bit enables or disables an interrupt request output to the CPU. An interrupt
Interrupt request request is output when both this bit and the external interrupt request flag bit 0
enable bit 0 (EIR0) are "1".
CHAPTER 12 EXTERNAL INTERRUPT CIRCUIT (EDGE)
Function
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