參數(shù)資料
型號： PSD4256G6V-10UIT
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 1M X 8 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝： PLASTIC, TQFP-80
文件頁數(shù)： 113/127頁
文件大?。?/td> 1091K
代理商： PSD4256G6V-10UIT
I/O ports
PSD4256G6V
19.15
Port Data registers
The Port Data registers, shown in Table 49, are used by the MCU to write data to or read
data from the ports. Table 49 shows the register name, the ports having each register type,
and MCU access for each register type. The registers are described next.
19.16
Data In
Port pins are connected directly to the Data In buffer. In MCU I/O Input mode, the pin input is
read through the Data In buffer.
19.17
Data Out register
Stores output data written by the MCU in the MCU I/O output mode. The contents of the
register are driven out to the pins if the Direction register or the output enable product term
is set to 1. The contents of the register can also be read back by the MCU.
Table 46.
Port pin Direction Control, Output Enable P.T. Defined
Direction register bit
Output Enable P.T.
Port pin mode
0
Input
0
1
Output
1
0
Output
1
Output
Table 47.
Port direction assignment example
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
1
Table 48.
Drive register pin assignment(1)
1.
NA = Not Applicable.
Drive
register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Port A
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Port B
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Port D
NA(1)
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Port E
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Port G
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
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