參數(shù)資料
型號(hào)： S3C70F2XX-SO
元件分類(lèi)： 微控制器/微處理器
英文描述： 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO32
封裝： 0.450 INCH, SOP-32
文件頁(yè)數(shù)： 15/179頁(yè)
文件大?。?/td> 1070K
代理商： S3C70F2XX-SO
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S3C70F2/C70F4/P70F4
I/O PORTS
10-1
10
I/O PORTS
OVERVIEW
The S3C70F2/C70F4 has 2 input ports and 5 I/O ports. Pin addresses for all I/O ports are mapped to locations
FF0H–FF6H in bank 15 of the RAM. The contents of I/O port pin latches can be read, written, or tested at the
corresponding address using bit manipulation instructions.
There are total of 6 input pins and 18 configurable I/O pin, including 8 high current I/O pins for a maximum
number of 24 I/O pins.
Port Mode Flags
Port mode flags (PM) are used to configure I/O ports 0 and 3 (port mode group 1), port 4 (port mode group 2),
and ports 5 and 6 (port mode group 3) to input or output mode by setting or clearing the corresponding I/O buffer.
PM flags are stored in three 8-bit registers in RAM area FE8H–FEDH, and are addressable by 8-bit write
instructions only.
Port 2 Mode Register
Port 2 (P2.0–P2.3) can be used as either for analog input or for digital input. P2MOD register settings determines
port 2 mode (analog or digital input) for specific port 2 pins.
Pull-Up Resistors
Pull-up resistors are assignable to input pins of ports 0, 1, 3, 4, 5 and 6. When a configurable I/O port pin serves
as an output pin, its assigned pull-up resistor is automatically disabled, even though the pin's pull-up resistor is
enabled by a corresponding bit setting in the pull-up resistor mode register (PUMOD).
PUMOD Control Register
The pull-up mode register (PUMOD) is an 8-bit register used to assign internal pull-up resistors by software to
specific I/O ports.
When a configurable I/O port pin is used as an output pin, its assigned pull-up resistor is automatically disabled,
even though the pin's pull-up is enabled by a corresponding PUMOD bit setting.
PUMOD is mapped to RAM address FDCH–FDDH and is addressable by 8-bit write instructions only.
RESET
clears PUMOD register values to logic zero, automatically disconnecting all software-assignable port pull-up
resistors.
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