参数资料
型号: MCC68HC711D3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, UUC
封装: DIE
文件页数: 69/157页
文件大小: 2252K
代理商: MCC68HC711D3
General Description
Read/Write (R/W)
MC68HC711D3 — Rev. 2
Data Sheet
MOTOROLA
General Description
19
1.12 Read/Write (R/W)
This pin performs either of two separate functions, depending on the operating
mode.
In single-chip and bootstrap modes, R/W functions as input/output port D
bit 7. Refer to Section 5. Input/Output (I/O) Ports for further information.
In expanded multiplexed and test modes, R/W performs a read/write
function. R/W controls the direction of transfers on the external data bus.
1.13 Port D Bit 6/Address Strobe (PD6/AS)
This pin performs either of two separate functions, depending on the operating
mode.
In single-chip and bootstrap modes, the pin functions as input/output port D
bit 6.
In the expanded multiplexed and test modes, it provides an address strobe
(AS) function. AS is used to demultiplex the address and data signals at
port C.
Refer to Section 2. Operating Modes and Memory for further information.
1.14 Input/Output Lines (PA7–PA0, PB7–PB0, PC7–PC0, and PD7–PD0)
In the 44-pin PLCC package, 32 input/output lines are arranged into four 8-bit
ports: A, B, C, and D. The lines of ports B, C, and D are fully bidirectional. Port A
has two bidirectional, three input-only, and three output-only lines in the 44-pin
PLCC packaging. In the 40-pin DIP, two of the output-only lines are not bonded.
Each of these four ports serves a purpose other than input/output (I/O), depending
on the operating mode or peripheral functions selected.
NOTE:
Ports B, C, and two bits of port D are available for I/O functions only in single-chip
and bootstrap modes.
Refer to Table 1-1 for details about the functions of the 32 port signals within
different operating modes.
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