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參數資料
型號: MC68HC05X4
廠商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數: 64/156頁
文件大小: 926K
代理商: MC68HC05X4
Parallel input/output ports
MC68HC05X4 Rev 1.0
64
Parallel input/output ports
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Input/output programming
Bi-directional port lines may be programmed as inputs or outputs under
software control. The direction of each pin is determined by the state of
the corresponding bit in the port data direction register (DDR). Each port
has an associated DDR. Any I/O port pin is configured as an output if its
corresponding DDR bit is set. A pin is configured as an input if its
corresponding DDR bit is cleared.
At power-on or reset, all DDRs are cleared, thus configuring all port pins
as inputs. The data direction registers can be 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
Figure 1
and
Table 1
.
Port A
Port A is an 8-bit bi-directional port. The port A data register is at $0000
and the data direction register (DDR) is at $0004. Reset does not affect
the data register, but clears the data direction register, thereby returning
the ports to inputs. Writing a ‘1’ to a DDR bit sets the corresponding port
pin to output mode.
Figure 1. Standard I/O port structure
Latched data
register bit
DDRn
DATA
Input
buffer
Output
buffer
O/P
data
buffer
M
DDRn
1
1
0
0
DATA
0
1
0
1
I/O pin
0
1
tristate
tristate
I/O
Pin
Output
Input
Data direction
register bit
2-ports
F
Freescale Semiconductor, Inc.
n
.
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