參數(shù)資料
型號(hào)： UPD75402ACT
廠商： NEC Corp.
英文描述： 4 BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 4位單片機(jī)
文件頁數(shù)： 14/48頁
文件大?。?/td> 515K
代理商： UPD75402ACT
14
μ
PD75402A(A)
5. PERIPHERAL HARDWARE FUNCTIONS
5.1 PORTS
The
μ
PD75402A(A) has the following three types of I/O port:
6 CMOS input pins (PORT0 and PORT1)
12 CMOS I/O pins (PORT2, PORT3, and PORT6)
4 N-ch open-drain I/O pins (PORT5)
Total: 22 pins
Table 5-1 Functions of Ports
Note
PORT3, PORT5, and PORT6 can directly drive the LED.
Port name
PORT0
PORT1
PORT3
Note
PORT2
PORT6
Note
PORT5
Note
Function
4-bit Input
4-bit I/O
4-bit I/O (N-ch
open-drain I/O
with a withstand
voltage of 10 V)
Remarks
Also used for SO/SB0, SI, SCK, INT0, and
INT2.
—
Port 2 is also used for PCL.
This port can incorporate a pull-up
resistor as a mask option bit by bit.
Operation and feature
Allows read and test at any
time regardless of the operation
modes of dual function pins.
Allows input or output mode
setting bit by bit.
Allows input or output mode
setting in units of 4 bits.
Allows input or output mode
setting in units of 4 bits.
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