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參數資料
型號： MC68HC11A8BCFN2
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, MROM, 2 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁數： 39/158頁
文件大小： 776K
代理商： MC68HC11A8BCFN2
MC68HC11A8
TECHNICAL DATA
PARALLEL I/O
MOTOROLA
4-1
4
4 PARALLEL I/O
The MC68HC11A8 has 40 I/O pins arranged as five 8-bit ports. All of these pins serve
multiple functions depending on the operating mode and data in the control registers.
This section explains the operation of these pins only when they are used for parallel
l/O.
Ports C and D are used as general purpose input and/or output pins under direct con-
trol of their respective data direction registers. Ports A, B, and E, with the exception of
port A pin 7, are fixed direction inputs or outputs and therefore do not have data direc-
tion registers. Port B, port C, the STRA pin, and the STRB pin are used for strobed
and/or handshake modes of parallel l/O, as well as general purpose l/O.
4.1 General-Purpose I/O (Ports C and D)
Each port l/O line has an associated bit in a specific port data register and port data
direction register. The data direction register bits are used to specify the primary direc-
tion of data for each l/O line. When an output line is read, the value at the input to the
pin driver is returned. When a line is configured as an input, that pin becomes a high-
impedance input. If a write is executed to an input line, the value does not affect the l/
O pin, but is stored in an internal latch. When the line becomes an output, this value
appears at the l/O pin. Data direction register bits are cleared by reset to configure l/
O pins as inputs.
The AS and R/W pins are dedicated to bus control while in the expanded multiplexed
operating modes, or parallel l/O strobes (STRA and STRB) while in the single chip op-
erating modes.
4.2 Fixed Direction I/O (Ports A, B, and E)
The lines for ports A, B, and E (except for port A bit 7) have fixed data directions. When
port A is being used for general purpose l/O, bits 0, 1, and 2 are configured as input
only and writes to these lines have no effect. Bits 3, 4, 5, and 6 of port A are configured
as output only and reads of these lines return the levels sensed at the input to the line
drivers. Port A bit 7 can be configured as either a general-purpose input or output us-
ing the DDRA7 bit in the pulse accumulator control register. When port B is being used
for general purpose output, it is configured as output only and reads of these lines will
return the levels sensed at the input of the pin drivers. Port E contains the eight A/D
channel inputs, but these lines may also be used as general purpose digital inputs.
Writes to the port E address have no effect.
相關PDF資料
PDF描述
MC68HC11A8BCFU2 HCMOS Single-Chip Microcontroller
MC68HC11A8BCP2 HCMOS Single-Chip Microcontroller
MC68HC11A8BMP2 HCMOS Single-Chip Microcontroller
MC68HC11A8BVP2 HCMOS Single-Chip Microcontroller
MC68HC11A1CFN2 HCMOS Single-Chip Microcontroller
相關代理商/技術參數
參數描述
MC68HC11A8BCFU2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A8BCP2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A8BMP2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A8BVP2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A8FN 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
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