參數(shù)資料
型號： MC68HC05B16
廠商： Motorola, Inc.
元件分類： DC/DC變換器
英文描述： RS-S_D(Z) Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 24V; Output Voltage (Vdc): 15V; Power: 2W; 2:1 and 4:1 Wide Input Voltage Ranges; 1kVDC, 2kVD & 3kVDC Isolation; UL94V-0 Package Material; Continuous Short Circuit Protection; Low Noise; No External Capacitor needed; Efficiency to 83%
中文描述： 高密度互補(bǔ)金屬氧化物半導(dǎo)體（HCMOS）微機(jī)組
文件頁數(shù)： 39/96頁
文件大?。?/td> 3045K
代理商： MC68HC05B16
Freescale
5-8
MC68HC05SR3
RESETS AND INTERRUPTS
5
TIF — Timer Interrupt Flag
1 (set)
–
A timer interrupt (timer overflow) has occurred.
0 (clear) –
A timer interrupt (timer overflow) has not occurred.
The I-bit in the CCR must be cleared in order for the timer interrupt to be processed. The interrupt
will vector to the interrupt service routine at the address specified by the contents in $1FF6-$0FF7.
5.2.2.4
Keyboard Interrupt (KBI)
Keyboard interrupt function is associated with Port A pins. The keyboard interrupt function is
enabled by setting the keyboard interrupt enable bit KBIE (bit 7 of MCR at $0C) and the individual
enable bits KBE0-KBE7 (bits 0-7 of KBIM at $0B). When the KBEx bit is set, the corresponding
Port A pin will be configured as an input pin, regardless of the DDR setting, and a 20K
pull-up
resistor is connected to the pin, as shown in Figure 5-4. When a high to low transition is sensed
on the pin, a keyboard interrupt will be generated. An interrupt to the CPU will be generated if the
I-bit in the CCR is cleared.
The keyboard interrupt flag should be cleared in the interrupt service routine (by writing a “1” to
KBIC bit in the MCR at $0C) after the key is debounced. Debouncing will avoid spurious false
triggering.
The keyboard interrupt is negative-edge sensitive only, and the interrupt service routine is
specified by the contents in $1FF4-$1FF5.
Figure 5-4 Keyboard Interrupt Circuitry
Pad Logic
&
Keyboard
request
Interrupt
VDD
&
KBEx of KBIM
&
KBIE bit of MCR
($0C bit 7)
DDR0-DDR7
Internal Data bit (0-7), Port A
PAx
1 input for each of PA0-PA7
(8 input NAND)
20K
TPG
42
05SR3.Book Page 8 Thursday, August 4, 2005 1:08 PM
相關(guān)PDF資料
PDF描述
MC68HC05P3 RS3-S_D(Z) Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 05V; Power: 3W; 2:1 and 3:1 Wide Input Voltage Ranges; 1kVDC, 2kVDC & 3kVDC Isolation; UL94V-0 Package Material; Continuous Short Circuit Protection; Low Ripple and Noise; Remote On/Off Control; Efficiency to 83%
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MC68HC05B5 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
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