參數(shù)資料
型號(hào)： MC68HC05BD7B
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42
封裝： SDIP-42
文件頁(yè)數(shù)： 39/85頁(yè)
文件大小： 302K
代理商： MC68HC05BD7B
MOTOROLA
SECTION 7: INPUT/OUTPUT PORTS
Page 34
GENERAL RELEASE SPECIFICATION
MC68HC05BD7 Rev. 2.0
PRELIMINARY
shares its pin with the CLAMP output. See SECTION 10 for the description of CLAMP
signal. It becomes the CLAMP output when the CLAMP bit in SPIOCR register is set. PD3
is a +12V open-drain I/O pin which shares its pin with the SOG input. Also see SECTION
10 for the description of SOG input. It is configured as SOG input when the SOG bit in
SPIOCR register is set. The Port D data register is at $03 and the data direction register
(DDR) is at $07. Reset does not affect the data register, yet clears the data direction
register, thereby returning the ports to inputs. Writing a one to a DDR bit sets the
corresponding port bit to output mode.
7.5
Input/Output Programming
Bidirectional port lines may be programmed as an input or an output under software control.
The direction of the pins 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.
During Reset, all DDRs are cleared, which configure all port pins as inputs. The data
direction registers are capable of being 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. See Figure 7-1 and .
Figure 7-1: Port I/O Circuitry
I/O
PIN
Read Data
Write Data
Data
Register Bit
Internal HC05
Data Bus
Reset
(RST)
Read/Write DDR
Data Direction
Register Bit
OUTPUT
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