參數(shù)資料
型號(hào): C05M68HC05M
廠商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 55/130頁
文件大?。?/td> 1541K
代理商: C05M68HC05M
Input/Output Ports
Port D
MC68HC705P6A
Rev. 2.0
Advance Information
MOTOROLA
Input/Output Ports
55
6.6 Port D
Port D is a 2-bit port with one bidirectional pin (PD5) and one input-only
pin (PD7). Pin PD7 is shared with the 16-bit timer. The port D data
register is located at address $0003 and its data direction register (DDR)
is located at address $0007. The contents of the port D data register are
indeterminate at initial powerup and must be initialized by user software.
Reset does not affect the data registers, but clears the DDRs, thereby
setting PD5 to input mode. Writing a 1 to DDR bit 5 sets PD5 to output
mode (see
Figure 6-4
).
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 6-4. 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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