參數(shù)資料
型號(hào)： MC68HC705SR3PE
廠商： Freescale Semiconductor
文件頁數(shù)： 39/96頁
文件大小： 0K
描述： IC MCU 3.75K 2.1MHZ OTP 40-DIP
標(biāo)準(zhǔn)包裝： 9
系列： HC05
核心處理器： HC05
芯體尺寸： 8-位
速度： 4MHz
外圍設(shè)備： LED，POR
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 3.75KB（3.75K x 8）
程序存儲(chǔ)器類型： OTP
RAM 容量： 192 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 4x8b
振蕩器型： 內(nèi)部
工作溫度： 0°C ~ 70°C
封裝/外殼： 40-DIP（0.600"，15.24mm）
包裝： 管件
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
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