參數(shù)資料
型號： MC68HC11A0CFN2
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： HCMOS Single-Chip Microcontroller
中文描述： 8-BIT, 2 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁數(shù)： 78/158頁
文件大小： 776K
代理商： MC68HC11A0CFN2
MOTOROLA
8-8
PROGRAMMABLE TIMER, RTI, AND PULSE ACCUMULATOR
MC68HC11A8
TECHNICAL DATA
8
PAIF — Pulse Accumulator Input Edge Interrupt Flag
This bit is set when an active edge is detected on the PAI input pin. This bit is cleared
by a write to the TFLG2 register with bit 4 set.
Bits 3-0 — Not Implemented
These bits always read zero.
8.2 Real-Time Interrupt
The real-time interrupt feature on the MCU is configured and controlled by using two
bits (RTR1 and RTR0) in the PACTL register to select one of four interrupt rates. The
RTII bit in the TMSK2 register enables the interrupt capability. Every timeout causes
the RTIF bit in TFLG2 to be set, and if RTII is set, an interrupt request is generated.
After reset, one entire real time interrupt period elapses before the RTIF flag is set for
the first time.
8.3 Pulse Accumulator
The pulse accumulator is an 8-bit read/write counter which can operate in either of two
modes (external event counting or gated time accumulation) depending on the state
of the PAMOD control bit in the PACTL register. In the event counting mode, the 8-bit
counter is clocked to increasing values by an external pin. The maximum clocking rate
for the external event counting mode is E clock divided by two. In the gated time ac-
cumulation mode, a free-running E clock/64 signal drives the 8-bit counter, but only
while the external PAI input pin is enabled.
The pulse accumulator uses port A bit 7 as its PAI input, but this pin also shares func-
tion as a general purpose l/O pin and as a timer output compare pin. Normally port A
bit 7 would be configured as an input when being used for the pulse accumulator. Note
that even when port A bit 7 is configured for output, this pin still drives the input to the
pulse accumulator.
8.3.1 Pulse Accumulator Control Register (PACTL)
Four bits in this register are used to control an 8-bit pulse accumulator system and two
other bits are used to select the rate for the real time interrupt system.
DDRA7 — Data Direction for Port A Bit 7
0 = Input only
1 = Output
PAEN — Pulse Accumulator System Enable
0 = Pulse accumulator off
1 = Pulse accumulator on
7
6
5
4
3
0
0
2
0
0
1
0
$
1
026
RESET
DDRA7
0
PAEN
0
PAMOD
0
PEDGE
0
RTR1
0
RTR0
0
PACTL
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC11A0CFN3 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
MC68HC11A0CFN3R2 制造商:Rochester Electronics LLC 功能描述:
MC68HC11A0CFN4 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers
MC68HC11A0CFNE3 功能描述:8位微控制器 -MCU 8B MCU 768RAM A/D 3MH 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
MC68HC11A0CFNE3 制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC
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