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| 型號(hào)： | MC68HC705CJ4FB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 33/114頁(yè) |
| 文件大?。?/td> | 4047K |
| 代理商： | MC68HC705CJ4FB |
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GENERAL RELEASE SPECIFICATION
INTERRUPTS
MC68HC(7)05CJ4
4-2
Rev. 2.1
1
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4.2 Hardware Controlled Interrupt Sequence
The following three functions (RESET, STOP, and WAIT) are not in the strictest
sense an interrupt; however, they are acted upon in a similar manner. Flowcharts
for hardware interrupts are shown in Figure 4-1. A discussion is provided below.
1. RESET — A low input on the RESET input pin causes the program to vector
to its starting address which is specified by the contents of memory locations
$1FFE and $1FFF. The I bit in the condition code register is also set. Much
of the MCU is configured to a known state during this type of reset.
2. STOP — The STOP instruction causes the oscillator to be turned off and the
processor to “sleep” until an external interrupt
(IRQ) or reset occurs.
3. WAIT — The WAIT instruction causes all processor clocks to stop, but
leaves the timer clocks running. This “rest” state of the processor can be
cleared by reset, or any hardware interrupt. There are no special wait vectors
for these individual interrupts.
Table 4-1. Vector Address for Interrupts and Reset
Register
Flag Name
Interrupts
CPU Interrupt
Vector Address
N/A
Reset
RESET
$1FFE–$1FFF
N/A
Software
SWI
$1FFC–$1FFD
N/A
External Interrupt
IRQ
$1FFA–$1FFB
TSR
ICF
Timer Input Capture
TIMER 1
$1FF8–$1FF9
TSR
OCF
Timer Output Compare
TIMER 1
$1FF8–$1FF9
TSR
TOF1
Timer 1 Overow
TIMER 1
$1FF8–$1FF9
SCSR
TDRE
Transmit Buffer Empty
SCI
$1FF6–$1FF7
SCSR
TC
Transmit Complete
SCI
$1FF6–$1FF7
SCSR
RDRF
Receiver Buffer Full
SCI
$1FF6–$1FF7
SCSR
IDLE
Idle Line Detect
SCI
$1FF6–$1FF7
SCSR
OR
Overrun
SCI
$1FF6–$1FF7
SPSR
SPIF
Transfer Complete
SPI
$1FF4–$1FF5
SPSR
MODF
Mode Fault
SPI
$1FF4–$1FF5
MBSR
SMF
Slave M-Bus Flag
IIC
$1FF2–$1FF3
TCSR
TOF2
Timer 2 Overow
TIMER 2
$1FF0–$1FF1
TCSR
RTI
Real Time Interrupt
TIMER 2
$1FF0–$1FF1
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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