mc68hc711d3 Freescale Semiconductor, Inc, mc68hc711d3 Datasheet - Page 49

• Manufacturer Part Number: mc68hc711d3
• Description: M Hc11 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Bits 7, 6, and 2 — Not implemented
IRQE — IRQ Edge/Level Sensitivity Select
DLY — Stop Mode Exit Turnon Delay
CME — Clock Monitor Enable
CR1 and CR0 — COP Timer Rate Selects
4.3 Interrupts
Excluding reset-type interrupts, there are 17 hardware interrupts and one software interrupt that can be
generated from all the possible sources. These interrupts can be divided into two categories: maskable
and non-maskable. Fifteen of the interrupts can be masked using the I bit of the condition code register
(CCR). All the on-chip (hardware) interrupts are individually maskable by local control bits. The software
interrupt is non-maskable. The external input to the XIRQ pin is considered a non-maskable interrupt
because it cannot be masked by software once it is enabled. However, it is masked during reset and upon
receipt of an interrupt at the XIRQ pin. Illegal opcode is also a non-maskable interrupt.
Freescale Semiconductor
Always read 0.
This bit can be written only once during the first 64 E-clock cycles after reset in normal modes.
This bit is set during reset and can be written only once during the first 64 E-clock cycles after reset in
normal modes. If an external clock source rather than a crystal is used, the stabilization delay can be
inhibited because the clock source is assumed to be stable.
The COP system is driven by a constant frequency of E ÷ 2
divide-by value to arrive at the COP timeout rate. These bits are cleared during reset and can be written
only once during the first 64 E-clock cycles after reset in normal modes. The value of these bits is:
1 = IRQ is configured to respond only to falling edges.
0 = IRQ is configured for low-level wired-OR operation.
1 = A stabilization delay of 4064 E-clock cycles is imposed before processing resumes after a stop
0 = No stabilization delay is imposed after story recovery.
1 = Clock monitor circuit is enabled.
0 = Clock monitor circuit is disabled.
mode wakeup.
Address:
Reset:
Read:
Write:
Figure 4-2. System Configuration Options Register (OPTION)
$0039
Bit 7
0
0
CR1
0
0
1
1
6
0
0
MC68HC711D3 Data Sheet, Rev. 2.1
IRQE
5
0
CR0
0
1
0
1
DLY
4
1
CME
3
0
Divided By
E ÷ 2
15
16
64
. These two bits specify an additional
1
4
15
2
0
0
CR1
1
0
CR0
Bit 0
0
Interrupts
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