參數(shù)資料
型號(hào): MC908JK3EMDWER
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 19/180頁(yè)
文件大?。?/td> 0K
描述: MCU 8BIT 128RAM 4K FLASH 20-SOIC
標(biāo)準(zhǔn)包裝: 1,000
系列: HC08
核心處理器: HC08
芯體尺寸: 8-位
速度: 8MHz
外圍設(shè)備: LED,LVD,POR,PWM
輸入/輸出數(shù): 15
程序存儲(chǔ)器容量: 4KB(4K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 12x8b
振蕩器型: 外部
工作溫度: -40°C ~ 125°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 帶卷 (TR)
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IRQ Module During Break Interrupts
MC68HC908JL3E Family Data Sheet, Rev. 4
Freescale Semiconductor
115
11.3.1 IRQ Pin
A zero on the IRQ pin can latch an interrupt request into the IRQ latch. A vector fetch, software clear, or
reset clears the IRQ latch.
If the MODE bit is set, the IRQ pin is both falling-edge-sensitive and low-level-sensitive. With MODE set,
both of the following actions must occur to clear IRQ:
Vector fetch or software clear — A vector fetch generates an interrupt acknowledge signal to clear
the latch. Software may generate the interrupt acknowledge signal by writing a logic one to the ACK
bit in the interrupt status and control register (INTSCR). The ACK bit is useful in applications that
poll the IRQ pin and require software to clear the IRQ latch. Writing to the ACK bit prior to leaving
an interrupt service routine can also prevent spurious interrupts due to noise. Setting ACK does
not affect subsequent transitions on the IRQ pin. A falling edge that occurs after writing to the ACK
bit latches another interrupt request. If the IRQ mask bit, IMASK, is clear, the CPU loads the
program counter with the vector address at locations $FFFA and $FFFB.
Return of the IRQ pin to logic one — As long as the IRQ pin is at logic zero, IRQ remains active.
The vector fetch or software clear and the return of the IRQ pin to logic one may occur in any order. The
interrupt request remains pending as long as the IRQ pin is at logic zero. A reset will clear the latch and
the MODE control bit, thereby clearing the interrupt even if the pin stays low.
If the MODE bit is clear, the IRQ pin is falling-edge-sensitive only. With MODE clear, a vector fetch or
software clear immediately clears the IRQ latch.
The IRQF bit in the INTSCR register can be used to check for pending interrupts. The IRQF bit is not
affected by the IMASK bit, which makes it useful in applications where polling is preferred.
Use the BIH or BIL instruction to read the logic level on the IRQ pin.
NOTE
When using the level-sensitive interrupt trigger, avoid false interrupts by
masking interrupt requests in the interrupt routine.
NOTE
An internal pull-up resistor to VDD is connected to the IRQ pin; this can be
disabled by setting the IRQPUD bit in the CONFIG2 register ($001E).
11.4 IRQ Module During Break Interrupts
The system integration module (SIM) controls whether the IRQ latch can be cleared during the break
state. The BCFE bit in the break flag control register (BFCR) enables software to clear the latches during
To allow software to clear the IRQ latch during a break interrupt, write a one to the BCFE bit. If a latch is
cleared during the break state, it remains cleared when the MCU exits the break state.
To protect the latches during the break state, write a zero to the BCFE bit. With BCFE at zero (its default
state), writing to the ACK bit in the IRQ status and control register during the break state has no effect on
the IRQ latch.
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MC908JK3MDWE 功能描述:IC MCU 4K FLASH 20-SOIC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:HC08 標(biāo)準(zhǔn)包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設(shè)備:- 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:8KB(8K x 8) 程序存儲(chǔ)器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱:864285
MC908JK8CDWE 功能描述:8位微控制器 -MCU MCU 8K FLASH 8 BIT ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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