mc68hc11d0cfn2 Freescale Semiconductor, Inc, mc68hc11d0cfn2 Datasheet - Page 19

• Manufacturer Part Number: mc68hc11d0cfn2
• Description: M68hc11 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

1.12 Read/Write (R/W)
1.13 Port D Bit 6/Address Strobe (PD6/AS)
1.14 Input/Output Lines (PA7–PA0, PB7–PB0, PC7–PC0, and PD7–PD0)
MC68HC711D3 — Rev. 2
MOTOROLA
NOTE:
This pin performs either of two separate functions, depending on the operating
mode.
This pin performs either of two separate functions, depending on the operating
mode.
Refer to
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.
Ports B, C, and two bits of port D are available for I/O functions only in single-chip
and bootstrap modes.
Refer to
different operating modes.
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Freescale Semiconductor, Inc.
In single-chip and bootstrap modes, R/W functions as input/output port D
bit 7. Refer to
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.
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.
Section 2. Operating Modes and Memory
Table 1-1
For More Information On This Product,
Go to: www.freescale.com
for details about the functions of the 32 port signals within
Section 5. Input/Output (I/O) Ports
General Description
for further information.
for further information.
General Description
Read/Write (R/W)
Data Sheet
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