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ST7294 数据表(PDF) 24 Page - STMicroelectronics

部件名 ST7294
功能描述  8-BIT MCU WITH 6K ROM, EEPROM AND 16-BIT TIMER WITH INPUT CAPTURE AND DUAL OUTPUT COMPARE
PDF  69 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST7294 数据表(HTML) 24 Page - STMicroelectronics

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ST7294
I/O PORTS (Continued)
Table 7. I/O Pin Logic
Note (*): RW is an internal signal.
R/W*
DDR
I/O Pin Functions
00
The I/O pin is in input mode. Data is written into the output data latch.
01
Data is written into the output data latch and output the I/O pin.
10
The state of the I/O pin is read.
11
The I/O pin is in an output mode. The output data latch is read.
DATA REGISTERS
Port A: 00h
Port B: 01h
Port C: 02h
Read/Write
Reset Value: Undefined
70
MSB
LSB
DATA DIRECTION REGISTERS
Port A: 04h
Port B: 05h
Port C: 06h
Read/Write
Reset Value: 00h (as inputs)
70
MSB
LSB



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