NEC PD75402A Manuale Utente
11
CHAPTER 2. PIN FUNCTIONS
Functions
A 4-bit input port (Port 0).
For P01 to P03, it is designatable to build in the pull-up resistor by
software in 3-bit units.
A 2-bit input port (Port 1).
P10 is built in with the noise eliminator by the sampling clock.
P12 is built in with the noise eliminator by analog delay.
For P12, it is designatable to build in the pull-up resistor by
software.
A 4-bit input/output port (Port 2).
It is designatable to input/output in 4-bit units.
It is designatable to build in the pull- up resistor by software in 4-
bit units.
A programmable 4-bit input/output port (Port 3).
It is designatable to input/output bit-wise.
It is designatable to build in the pull-up resistor by software in 4-
bit units.
It is possible to drive the LED directly.
A 4-bit N-ch open drain input/output port (Port 5).
It is designatable to input/output in 4-bit units.
It is designatable to build in the pull-up resistor by mask
option bit-wise.
It is possible to drive the LED directly.
A 4-bit input/output port (Port 6).
It is designatable to input/output in 4-bit units.
It is designatable to build in the pull-up resistor by software in
4-bit units.
It is possible to drive the LED directly.
2.1
µ
PD75402A PIN FUNCTION LIST
2.1.1
Port Pin List
Table 2-1 Port Pin List
Pin Name
P00
P01
P02
P03
P10
P12
P20
P21
P22
P23
Input/Output
Input
Input/output
Input/output
Input
Input/output
Input/output
Dual-Function Pin
SCK
SO/SB0
SI
INT0
INT2
PCL
Input
P30 to P33
Input/output
P50 to P53
Input/output
P60 to P63
Remarks
1.
In the
µ
PD75402A, 8-bit input/output with 2 ports making up a pair is impossible.
2.
For the status of each pin at reset, see CHAPTER 8 “RESET FUNCTION”.