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參數(shù)資料
| 型號(hào)： | MC68HC05V7CFNR2 |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁(yè)數(shù)： | 112/170頁(yè) |
| 文件大小： | 589K |
| 代理商： | MC68HC05V7CFNR2 |
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MOTOROLA
SECTION 5: INTERRUPTS
Page 32
MC68HC05V7 Specification Rev. 1.0
5.2
RESET INTERRUPT SEQUENCE
The RESET function is not in the strictest sense an interrupt; however, it is acted upon in a
similar manner, as shown in Figure 5-1. A low level input on the RESET pin or internally
generated RST signal causes the program to vector to its starting address which is
specified by the contents of memory locations $3FFE and $3FFF. The I-bit in the condition
code register is also set. The MCU is configured to a known state during this type of reset
as described in SECTION 6 RESETS.
5.3
SOFTWARE INTERRUPT (SWI)
The SWI is an executable instruction and a non-maskable interrupt since it is executed
regardless of the state of the I-bit in the CCR. If the I-bit is zero (interrupts enabled), the
SWI instruction executes after interrupts that were pending before the SWI was fetched, or
before interrupts generated after the SWI was fetched. The interrupt service routine
address is specified by the contents of memory locations $3FFC and $3FFD.
5.4
HARDWARE INTERRUPTS
All hardware interrupts except RESET are maskable by the I-bit in the CCR. If the I-bit is
set, all hardware interrupts (internal and external) are disabled. Clearing the I-bit enables
the hardware interrupts. There are two types of hardware interrupts which are explained in
the following sections.
5.5
EXTERNAL INTERRUPT (IRQ)
The IRQ pin provides an asynchronous interrupt to the CPU. A block diagram of the IRQ
function is shown in Figure 5-2.
NOTE:
The BIH and BIL instructions will only apply to the level on the IRQ pin
itself, and not to the output of the logic OR function with the Port A and
Port C IRQ interrupts. The state of the individual Port A and Port C pins
can be checked by reading the appropriate Port A and Port C pins as
inputs.
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