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參數資料
型號: MC68HC05P18A
廠商: Motorola, Inc.
英文描述: Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器)
中文描述: 低成本HCMOS微控制器(低成本,8位HCMOS微控制器)
文件頁數: 59/130頁
文件大小: 1200K
代理商: MC68HC05P18A
Input/Output (I/O) Ports
Port D
MC68HC05P18A
Technical Data
MOTOROLA
Input/Output (I/O) Ports
59
L
G
R
7.6 Port D
Port D is a 2-bit port with:
One bidirectional pin, PD5/CKOUT
One input-only pin, PD7
Pin PD7 is shared with the 16-bit timer. There is a mask option to have
PD5 replaced with the clock output. The port D data register is located
at address $0003 and its data direction register (DDR) is located at
address $0007. Reset does not affect the data registers, but clears the
DDRs, thereby setting PD5/CKOUT to input mode. Writing a 1 to DDR
bit 5 sets PD5/CKOUT to output mode (see
Figure 7-4
).
Port D may be used for general I/O applications regardless of the state
of the 16-bit timer. Since PD7 is an input-only line, its state can be read
from the port D data register at any time.
Figure 7-4. Port D I/O Circuitry
READ $0003
WRITE $0003
READ $0007
DATA
REGISTER BIT
I/O
PIN
OUTPUT
INTERNAL HC05
DATA BUS
RESET
(RST)
WRITE $0007
DATA DIRECTION
REGISTER BIT
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