MC68HC812A4 Datasheet, PDF (73/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

4.5 Interrupt Registers
This section describes the interrupt registers.
Resets and Interrupts
Interrupt Registers
4.5.1 Interrupt Control Register
Address: $001E
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
0
0
0
IRQE IRQEN DLY
Write:
Reset: 0
1
1
0
0
0
0
0
= Unimplemented
Figure 4-1. Interrupt Control Register (INTCR)
Read: Anytime
Write: Varies from bit to bit
IRQE — IRQ Edge-Sensitive-Only Bit
IRQE can be written once in normal modes. In special modes, IRQE
can be written anytime, but the first write is ignored.
1 = IRQ responds only to falling edges.
0 = IRQ pin responds to low levels.
IRQEN — IRQ Enable Bit
IRQEN can be written anytime in all modes. The IRQ pin has an
internal pullup.
1 = IRQ pin and key wakeup D connected to interrupt logic
0 = IRQ pin and key wakeup D disconnected from interrupt logic
DLY — Oscillator Startup Delay on Exit from Stop Mode Bit
DLY can be written once in normal modes. In special modes, DLY can
be written anytime.
The delay time of about 4096 cycles is based on the M-clock rate
chosen.
1 = Stabilization delay on exit from stop mode
0 = No stabilization delay on exit from stop mode
Advance Information
MOTOROLA
Resets and Interrupts
MC68HC812A4 — Rev. 3.0
73