參數(shù)資料
型號: MC68HC705CT4FB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.048 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 106/152頁
文件大小: 964K
代理商: MC68HC705CT4FB
Parallel Input/Output (I/O)
Port D
MC68HC705CT4 Rev. 2.0
General Release Specification
MOTOROLA
Parallel Input/Output (I/O)
57
NON-DISCLOSURE
AGREEMENT
REQUIRED
7.6 Port D
Port D is a 7-bit bidirectional port. Two of its pins are shared with the SSI
subsystem, four are shared with the comparators, and one is shared with
the timer. During reset, all seven bits become valid input ports because
all special function output drivers associated with the timer and SSI
subsystems are disabled.
7.7 Input/Output Port Pin Programming
Port pins may be programmed as inputs or outputs under software
control. The direction of the pins is determined by the state of the
corresponding bit in the port data direction register (DDR). Each I/O port
has an associated DDR. Any I/O port pin is configured as an output if its
corresponding DDR bit is set to a logic one. A pin is configured as an
input if its corresponding DDR bit is cleared to a logic 0.
At power-on or reset, all DDRs are cleared, which configures all pins as
inputs. The data direction registers are capable of being written to or
read by the processor. During the programmed output state, a read of
the data register actually reads the value of the output data latch and not
the I/O pin.
Refer to Table 7-1 and to Figure 7-2 for additional information.
Table 7-1. I/O PIn Functions
R/W
DDR
I/O Pin Functions
00
The I/O pin is in input mode. Data is written into the output
data latch.
01
Data is written into the output data latch and output to the
I/O pin.
1
0
The state of the I/O pin is read.
11
The I/O pin is in an output mode. The output data latch is
read.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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