MCMC68HC05L16 Freescale Semiconductor, Inc, MCMC68HC05L16 Datasheet - Page 46

• Manufacturer Part Number: MCMC68HC05L16
• Description: M68hc05 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Resets and Interrupts
4.4 Interrupt Status Register
IRQ1F — IRQ1 Interrupt Flag
IRQ2F — IRQ2 Interrupt Flag
Bit 5 — Reserved
KWIF — Key Wakeup Interrupt Flag
RIRQ1 — Reset IRQ1 Flag
RIRQ2 — Reset IRQ2 Flag
Bit 1 — Reserved
RKWIF — Reset KWI Flag
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When IRQ1S = 0, the falling edge or low level at the IRQ1 pin sets IRQ1F. When IRQ1S = 1, only the
falling edge sets the IRQ1F bit. If the IRQ1E bit and this bit are set, an interrupt is generated. This
read-only bit is cleared by writing a logic 1 to the RIRQ1 bit. Reset clears this bit.
When IRQ2S = 0, the falling edge or low level at the IRQ2 pin sets IRQ2F. When IRQ2S = 1, only the
falling edge sets the IRQ2F bit. If the IRQ2E bit and this bit are set, an interrupt is generated. This
read-only bit is cleared by writing a logic 1 to the RIRQ2 bit. Reset clears this bit.
This bit is not used and is always read as logic 0.
When the KWIEx bit in the KWIEN register is set, the falling edge at the KWIx pin sets the KWIF bit. If
the KWIE bit and this bit are set, an interrupt is generated. This read-only bit is cleared by writing a
logic 1 to the RKWIF bit. Reset clears this bit.
The RIRQ1 bit is a write-only bit and is always read as logic 0. Writing a logic 1 to this bit clears the
IRQ1F bit and writing logic 0 to this bit has no effect.
The RIRQ2 bit is a write-only bit and is always read as logic 0. Writing a logic 1 to this bit clears the
IRQ2F bit and writing a logic 0 to this bit has no effect.
This bit is not used and is always read as logic 0.
The RKWIF bit is a write-only bit and is always read as logic 0. Writing a logic 1 to this bit clears the
KWIF bit and writing a logic 0 to this bit has no effect.
Address:
Reset:
Read:
Write:
IRQ1F
$0009
Bit 7
0
Figure 4-8. Interrupt Status Register (INTSR)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
= Unimplemented
IRQ2F
6
0
5
0
0
KWIF
4
0
RIRQ1
3
0
0
RIRQ2
2
0
0
1
0
0
Freescale Semiconductor
RKWIF
Bit 0
0
0