參數(shù)資料
型號： MC68HC711D3CP3
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 97/138頁
文件大?。?/td> 1047K
代理商： MC68HC711D3CP3
MC68HC711D3 Data Sheet, Rev. 2.1
Freescale Semiconductor
61
Chapter 5
Input/Output (I/O) Ports
5.1 Introduction
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
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:
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
The remaining ports are unaffected by mode changes.
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.
5.2 Port A
Port A shares functions with the timer system and has:
Three input only pins
Three output only pins
Two bidirectional I/O pins
Pins PA6 and PA4 are not bonded in the 40-pin dual in-line package (DIP), and their OC output functions
are unavailable, but their software interrupts are available.
Address:
$0000
Bit 7
654321
Bit 0
Read:
PA7
PA6(1)
PA5
PA4(1)
PA3
PA2
PA1
PA0
Write:
Reset:
Hi-Z
0
Hi-Z
Alt. Func.:
And/Or:
PAI
OC1
OC2
OC1
OC3
OC1
OC4
OC1
IC4/OC5
OC1
IC1
—
IC2
—
IC3
—
1. This pin is not bonded in the 40-pin version.
Figure 5-1. Port A Data Register (PORTA)
相關(guān)PDF資料
PDF描述
MC68HC11D3CFN3 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC44
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