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HC705P6AGRS/D bảng dữ liệu(PDF) 53 Page - NXP Semiconductors

tên linh kiện HC705P6AGRS/D
Giải thích chi tiết về linh kiện  The Motorola MC68HC705P6A is an EPROM version of the MC68HC05P6 microcontroller
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General Release Specification
Port D
MC68HC705P6A — Rev. 1.0
General Release Specification
Input/Output Ports
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 one 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
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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