參數(shù)資料
型號(hào): MC68HC908QT1
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: 8 bit Microcontroller Unit (MCU)(8位MCU)
中文描述: 8位微控制器(MCU)(8位微控制器)
文件頁(yè)數(shù): 81/184頁(yè)
文件大?。?/td> 1763K
代理商: MC68HC908QT1
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Functional Description
MC68HC908QY/QT Family Data Sheet, Rev. 5
Freescale Semiconductor
81
Figure 9-2. Keyboard Interrupt Block Diagram
If the MODEK bit is set, the keyboard interrupt inputs are both falling edge and low-level sensitive, and
both of the following actions must occur to clear a keyboard interrupt request:
Vector fetch or software clear — A vector fetch generates an interrupt acknowledge signal to clear
the interrupt request. Software may generate the interrupt acknowledge signal by writing a 1 to the
ACKK bit in the keyboard status and control register (KBSCR). The ACKK bit is useful in
applications that poll the keyboard interrupt inputs and require software to clear the keyboard
interrupt request. Writing to the ACKK bit prior to leaving an interrupt service routine can also
prevent spurious interrupts due to noise. Setting ACKK does not affect subsequent transitions on
the keyboard interrupt inputs. A falling edge that occurs after writing to the ACKK bit latches
another interrupt request. If the keyboard interrupt mask bit, IMASKK, is clear, the central
processor unit (CPU) loads the program counter with the vector address at locations $FFE0 and
$FFE1.
Return of all enabled keyboard interrupt inputs to logic 1 — As long as any enabled keyboard
interrupt pin is at logic 0, the keyboard interrupt remains set. The auto wakeup interrupt input,
AWUIREQ, will be cleared only by writing to ACKK bit in KBSCR or reset.
The vector fetch or software clear and the return of all enabled keyboard interrupt pins to logic 1 may occur
in any order.
If the MODEK bit is clear, the keyboard interrupt pin is falling-edge sensitive only. With MODEK clear, a
vector fetch or software clear immediately clears the keyboard interrupt request.
Reset clears the keyboard interrupt request and the MODEK bit, clearing the interrupt request even if a
keyboard interrupt input stays at logic 0.
The keyboard flag bit (KEYF) in the keyboard status and control register can be used to see if a pending
interrupt exists. The KEYF bit is not affected by the keyboard interrupt mask bit (IMASKK) which makes
it useful in applications where polling is preferred.
KBIE0
KBIE5
.
.
.
D
Q
CK
CLR
V
DD
MODEK
IMASKK
KEYBOARD
INTERRUPT FF
VECTOR FETCH
DECODER
ACKK
INTERNAL BUS
RESET
KBI5
KBI0
SYNCHRONIZER
KEYF
KEYBOARD
INTERRUPT
REQUEST
TO PULLUP ENABLE
AWUIREQ
(1)
TO PULLUP ENABLE
1. For AWUGEN logic refer to
Figure 4-1. Auto Wakeup Interrupt Request Generation Logic
.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC908QT1CDW 功能描述:8位微控制器 -MCU 8 Bit 8MHz 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
MC68HC908QT1CDWE 制造商:Freescale Semiconductor 功能描述:
MC68HC908QT1CFQ 制造商:Rochester Electronics LLC 功能描述:NITRON DFN - Bulk
MC68HC908QT1CP 功能描述:IC MCU 1.5K FLASH 8-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:HC08 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C,IrDA,LIN,SPI,UART/USART 外圍設(shè)備:DMA,PDR,POR,PVD,PWM,溫度傳感器,WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB(64K x 8) 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN,36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND
MC68HC908QT1CPE 功能描述:8位微控制器 -MCU 1.5K FLASH W/O 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