mc68hc11d0cfn2 Freescale Semiconductor, Inc, mc68hc11d0cfn2 Datasheet - Page 67

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

5.1 Introduction
MC68HC711D3 — Rev. 2
MOTOROLA
Data Sheet — MC68HC711D3
The MC68HC711D3 has four 8-bit input/output (I/O) ports; A, B, C, and D. In the
40-pin version, port A bits 4 and 6 are not bonded. Port functions are controlled by
the particular mode of operation selected, as shown in
Functions.
In the single-chip and bootstrap modes, all the ports are configured as parallel
input/output (I/O) data ports. In expanded multiplexed and test modes, ports B, C,
and lines D6 (AS) and D7 (R/W) are configured as a memory expansion bus, with:
The remaining ports are unaffected by mode changes.
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Freescale Semiconductor, Inc.
Port B as the high-order address bus
Port C as the multiplexed address and data bus
AS as the demultiplexing signal
R/W as data bus direction control
Ports A and D can be used as general-purpose I/O ports, though each has
an alternate function.
Port A bits handle the timer functions.
Port D handles serial peripheral interface (SPI) and serial communications
interface (SCI) functions in addition to its bus direction control functions.
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Input/Output (I/O) Ports
Section 5. Input/Output (I/O) Ports
Table 1-1. Port Signal
Data Sheet
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