參數(shù)資料
型號： MC68HC11A1CP2
廠商： ABILIS SYSTEMS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP48
封裝： PLASTIC, DIP-48
文件頁數(shù)： 72/158頁
文件大?。?/td> 3803K
代理商： MC68HC11A1CP2
SIGNAL DESCRIPTIONS AND OPERATING MODES
MC68HC11A8
2-4
TECHNICAL DATA
2
2.1.8 A/D Converter Reference Voltages (VRL, VRH)
These two inputs provide the reference voltages for the analog-to-digital converter cir-
cuitry.
2.1.9 Strobe B and Read/Write (STRB/R/W)
This signal acts as a strobe B output or as a data bus direction indicator depending on
the operating mode.
In single-chip operating mode, the STRB output acts as a programmable strobe for
handshake with other parallel l/O devices. Refer to 4 PARALLEL I/O for additional in-
formation.
In expanded multiplexed operating mode, R/W is used to control the direction of trans-
fers on the external data bus. A low on the R/W signal indicates data is being written
to the external data bus. A high on this signal indicates that a read cycle is in progress.
R/W will stay low during consecutive data bus write cycles, such as in a double-byte
store. The NAND of inverted R/W with the E clock should be used as the write enable
signal for an external static RAM.
2.1.10 Strobe A and Address Strobe (STRA/AS)
This signal acts as an edge detecting strobe A input or as an address strobe bus con-
trol output depending on the operating mode.
In single-chip operating mode, the STRA input acts as a programmable strobe for
handshake with other parallel l/O devices. Refer to 4 PARALLEL I/O for additional in-
formation.
In expanded multiplexed operating mode, the AS output is used to demultiplex the ad-
dress and data signals at port C. Refer to 2.2.2 Expanded Multiplexed Operating
Mode for additional information.
2.1.11 Port Signals
Ports A, D, and E signals are independent of the operating mode. Port B provides eight
general purpose output signals in single-chip operating modes and provides eight
high-order address signals when the microcontroller is in expanded multiplexed oper-
ating modes. Port C provides eight general purpose input/output signals when the mi-
crocontroller is in singlechip operating modes. When the microcontroller is in
expanded multiplexed operating modes, port C is used for a multiplexed address/data
bus. Table 2-2 shows a summary of the 40 port signals as they relate to the operating
modes. Unused inputs and l/O pins configured as inputs should be terminated high or
low.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關代理商/技術參數(shù)
參數(shù)描述
MC68HC11A1CP3 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A1FN 制造商: 功能描述:
MC68HC11A1MFN 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11A1MFN2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A1MFNE 功能描述:8位微控制器 -MCU 8B MCU 256RAM A/D EE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 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 安裝風格:SMD/SMT
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