mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 340

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

External Interrupt (IRQ)
19.7 IRQ Registers
19.7.1 IRQ1 Status and Control Register
Data Sheet
340
Address:
Each IRQ is controlled and monitored by an status and control register.
The IRQ1 status and control register (INTSCR1) controls and monitors
operation of IRQ1. The INTSCR1 has the following functions:
IRQ1F — IRQ1 Flag Bit
ACK1 — IRQ1 Interrupt Request Acknowledge Bit
Reset:
Read:
Write:
•
•
•
•
•
•
This read-only status bit is high when the IRQ1 interrupt is pending.
Writing a logic 1 to this write-only bit clears the IRQ1 latch. ACK1
always reads as logic 0. Reset clears ACK1.
Figure 19-4. IRQ1 Status and Control Register (INTSCR1)
1 = IRQ1 interrupt pending
0 = IRQ1 interrupt not pending
IRQ1 Status and Control Register — $001E
IRQ2 Status and Control Register — $001C
Shows the state of the IRQ1 flag
Clears the IRQ1 latch
Masks IRQ1 interrupt request
Controls triggering sensitivity of the IRQ1 interrupt pin
$001E
Bit 7
0
0
External Interrupt (IRQ)
= Unimplemented
6
0
0
5
0
0
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
4
0
0
IRQ1F
3
0
ACK1
Freescale Semiconductor
2
0
0
IMASK1
1
0
MODE1
Bit 0
0