参数资料
型号: MC68HC08QT2VDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封装: EIAJ, SOIC-8
文件页数: 156/178页
文件大小: 2311K
代理商: MC68HC08QT2VDW
Functional Description
MC68HC08QY/QT Family Data Sheet, Rev. 1
Freescale Semiconductor
79
Figure 9-2. Keyboard Interrupt Block Diagram
The KBI vector fetch or software clear and the return of all enabled keyboard interrupt pins to a deasserted
level may occur in any order.
Reset clears the keyboard interrupt request and the MODEK bit, clearing the interrupt request even if a
keyboard interrupt input stays asserted.
9.3.1.2 MODEK = 0
If the MODEK bit is clear, the keyboard interrupt inputs are edge sensitive. The KBIPx bit will determine
whether an edge sensitive pin detects rising or falling edges. A KBI vector fetch or software clear
immediately clears the KBI latch.
The keyboard flag bit (KEYF) in KBSCR can be read to check for pending interrupts. The KEYF bit is not
affected by IMASKK, which makes it useful in applications where polling is preferred.
NOTE
Setting a keyboard interrupt enable bit (KBIEx) forces the corresponding
keyboard interrupt pin to be an input, overriding the data direction register.
However, the data direction register bit must be a 0 for software to read the
pin.
KBI LATCH
KEYBOARD
INTERRUPT
REQUEST
ACKK
INTERNAL BUS
RESET
KBIE0
KBI0
0
1
S
KBIP0
KBIEx
KBIx
0
1
S
KBIPx
DQ
CK
CLR
VDD
MODEK
IMASKK
SYNCHRONIZER
KEYF
TO PULLUP/
PULLDOWN ENABLE
VECTOR FETCH
DECODER
AWUIREQ
相关PDF资料
PDF描述
MB95F583HWQN-G-JNERE1 MICROCONTROLLER, PQCC32
MCF52234CVM60 32-BIT, FLASH, 60 MHz, RISC MICROCONTROLLER, PBGA121
MC9S12XEP768VAL 32-BIT, FLASH, 50 MHz, RISC MICROCONTROLLER, PQFP112
MC9S12XEQ512MAG 32-BIT, FLASH, 50 MHz, RISC MICROCONTROLLER, PQFP144
MC7448VS667NC 32-BIT, 667 MHz, RISC PROCESSOR, CBGA360
相关代理商/技术参数
参数描述
MC68HC08QT4 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MC68HC08QY1 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MC68HC08QY2 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MC68HC08QY4 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MC68HC08SR12 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers