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參數資料
| 型號： | MC68HC705BD3 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數： | 37/112頁 |
| 文件大小： | 676K |
| 代理商： | MC68HC705BD3 |
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MC68HC05BD3
MOTOROLA
4-5
RESETS AND INTERRUPTS
4
4.2.2
Maskable Hardware Interrupts
If the interrupt mask bit (I-bit) of the CCR is set, all maskable interrupts (internal and external) are
masked. Clearing the I-bit allows interrupt processing to occur.
Note:
The internal interrupt latch is cleared in the first part of the interrupt service routine;
therefore, one external interrupt pulse could be latched and serviced as soon as the
I-bit is cleared.
4.2.2.1
External Interrupt (IRQ)
The external interrupt IRQ can be software configured for “negative-edge” or “negative-edge and
level” sensitive triggering by the IRQN bit in the Multi-Function TImer Control and Status
register.
IRQN
1 (set)
–
Negative edge triggering for IRQ only
0 (clear) –
Level and negative edge triggering for IRQ
When the signal of the external interrupt pin, IRQ, satisfies the condition selected, an external
interrupt occurs. The actual processor interrupt is generated only if the interrupt mask bit of the
condition code register is also cleared. When the interrupt is recognized, the current state of the
processor is pushed onto the stack and the interrupt mask bit in the condition code register is set.
This masks further interrupts until the present one is serviced. The service routine address is
specified by the contents $3FFA & $3FFB.
The interrupt logic recognizes negative edge transitions and pulses (special case of negative
edges) on the external interrupt line. Figure 4-3 shows both a block diagram and timing for the
interrupt line (IRQ) to the processor. The first method is used if pulses on the interrupt line are
spaced far enough apart to be serviced. The minimum time between pulses is equal to the number
of cycles required to execute the interrupt service routine plus 21 cycles. Once a pulse occurs, the
next pulse should not occur until the MCU software has exited the routine (an RTI occurs). The
second configuration shows several interrupt lines wired-OR to perform the interrupt at the
processor. Thus, if the interrupt lines remain low after servicing one interrupt, the next interrupt is
recognized.
Note:
The internal interrupt latch is cleared in the first part of the service routine; therefore,
one (and only one) external interrupt pulse could be latched during t
ILIL
and serviced
as soon as the I bit is cleared.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
MFT Control and Status
$0008
TOF
RTIF
TOFIE
RTIE
IRQN
RT1
RT0
0000 0-11
TPG
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MC68HC705BD3P | 制造商:Motorola 功能描述:MOTOROLA NXC4C |
| MC68HC705BD7P1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC68HC705C4ACP | 制造商:Freescale Semiconductor 功能描述: |
| MC68HC705C8AB | 功能描述:IC MCU 8K OTP 2.1MHZ 42-SDIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設備:POR，PWM，溫度傳感器，WDT 輸入/輸出數:21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數據轉換器:A/D 6x12b 振蕩器型:內部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| MC68HC705C8ACB | 制造商:Rochester Electronics LLC 功能描述:HCO5 CORE + 8K RAM + EPR - Bulk |
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