參數(shù)資料
型號(hào): MC68HC05P1AP
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 80/124頁
文件大?。?/td> 3724K
代理商: MC68HC05P1AP
Input/Output Ports
Port D
MC68HC05P1A Rev. 3.0
General Release Specification
Input/Output Ports
NON-DISCLOSURE
AGREEMENT
REQUIRED
7.6 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. 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 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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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