參數(shù)資料
型號(hào)： MC68HC908RK2DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDSO20
封裝： PLASTIC, SOIC-20
文件頁數(shù)： 149/158頁
文件大?。?/td> 1020K
代理商： MC68HC908RK2DW
Keyboard/External Interrupt Module (KBI)
MC68HC908RK2 Data Sheet, Rev. 5.1
90
Freescale Semiconductor
7.5 I/O Registers
These registers control and monitor operation of the keyboard/external interrupt module:
IRQ and keyboard status and control register (INTKBSCR)
Keyboard interrupt enable register (KBIER)
7.5.1 IRQ and Keyboard Status and Control Register
The IRQ and keyboard status and control register (INTKBSCR) controls and monitors operation of the
keyboard/external interrupt module. The INTKBSCR has these functions:
Flags the keyboard interrupt requests
Acknowledges the keyboard interrupt requests
Masks the keyboard interrupt requests
Shows the state of the IRQ interrupt flag
Clears the IRQ interrupt latch
Masks the IRQ interrupt request
Controls the triggering sensitivity of the keyboard and IRQ interrupt pins
IRQF — IRQ Flag Bit
This read-only status bit is high when the IRQ interrupt is pending.
1 = IRQ interrupt pending
0 = IRQ interrupt not pending
ACKI — IRQ Interrupt Request Acknowledge Bit
Writing a 1 to this write-only bit clears the IRQ latch. ACKI always reads as 0. Reset clears ACKI.
IMASKI — IRQ Interrupt Mask Bit
Writing a 1 to this read/write bit disables IRQ interrupt requests. Reset clears IMASKI.
1 = IRQ interrupt requests disabled
0 = IRQ interrupt requests enabled
MODEI — IRQ Triggering Sensitivity Bit
This read/write bit controls the triggering sensitivity of the IRQ pin. Reset clears MODEI.
1 = IRQ interrupt requests on falling edges and low levels
0 = interrupt requests on falling edges only
KEYF — Keyboard Flag Bit
This read-only bit is set when a keyboard interrupt is pending. Reset clears the KEYF bit.
1 = Keyboard interrupt pending
0 = No keyboard interrupt pending
Address: $001A
Bit 7
654321
Bit 0
Read:
IRQF
0
IMASKI
MODEI
KEYF
0
IMASKK
MODEK
Write:
R
ACKI
R
ACKK
Reset:
00000000
R= Reserved
Figure 7-6. IRQ and Keyboard Status and Control Register (INTKBSCR)
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