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| 型号： | MC68HC05SR3FB |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | QFP-44 |
| 文件页数： | 32/96页 |
| 文件大小： | 3143K |
| 代理商： | MC68HC05SR3FB |
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Freescale
5-2
MC68HC05SR3
RESETS AND INTERRUPTS
5
5.1.3
Low Voltage Reset (LVR)
When the LVR function is enabled, an internal reset is generated if the supply voltage, VDD, drops
This LVR function is enabled by setting the LVRE bit in the Miscellaneous Control Register.
LVRE — Low Voltage Reset Enable
1 (set)
–
Low Voltage Reset function enabled.
0 (clear) –
Low Voltage Reset function disabled.
Note:
The LVR function should not be enabled when operating VDD=3V.
5.2
INTERRUPTS
The MC68HC05SR3 MCU can be interrupted by different sources – four maskable hardware
interrupt and one non-maskable software interrupt:
Software Interrupt Instruction (SWI)
External signal on IRQ pin
External signal on IRQ2 pin
TImer Overflow
Keyboard
If the interrupt mask bit (I-bit) in the Condition Code Register (CCR) is set, all maskable interrupts
are disabled. Clearing the I-bit enables interrupts.
Interrupts cause the processor to save the register contents on the stack and to set the interrupt
mask (I-bit) to prevent additional interrupts. The RTI instruction causes the register contents to be
recovered from the stack and normal processing to resume.
Unlike reset, hardware interrupts do not cause the current instruction execution to be halted, but
are considered pending until the current instruction is complete. The current instruction is the one
already fetched and being operated on. When the current instruction is complete, the processor
checks all pending hardware interrupts. If interrupts are not masked (CCR I-bit clear) the
processor proceeds with interrupt processing; otherwise, the next instruction is fetched and
executed. Table 5-1 shows the relative priority of all the possible interrupt sources. Figure 5-2
shows the interrupt processing flow.
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Miscellaneous Control Register
$0C
KBIE
KBIC
INTO
INTE LVRE
SM
IRQ2F IRQ2E 0001 0000
TPG
36
05SR3.Book Page 2 Thursday, August 4, 2005 1:08 PM
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