參數(shù)資料
型號: MC68HC711D3MFN3
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, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 123/157頁
文件大?。?/td> 2252K
代理商: MC68HC711D3MFN3
Input/Output (I/O) Ports
Data Sheet
MC68HC711D3 — Rev. 2
68
Input/Output (I/O) Ports
MOTOROLA
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.
PORTA can be read any time. Inputs return the pin level, whereas outputs return
the pin driver input level. If written, PORTA stores the data in an internal latch. It
drives the pins only if they are configured as outputs. Writes to PORTA do not
change the pin state when the pins are configured for timer output compares.
Out of reset, port A bits 7 and 3–0 are general high-impedance inputs, while
bits 6–4 are outputs, driving low. On bidirectional lines PA7 and PA3, the timer
forces the I/O state to be an output if the associated output compare is enabled. In
this case, the data direction bits DDRA7 and DDRA3 in PACTL will not be changed
or have any effect on those bits. When the output compare functions associated
with these pins are disabled, the DDR bits in PACTL govern the I/O state.
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)
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