Overview Of I/O Ports; Table 4.1-1 Port Function - Fujitsu F2MC-8L Series Hardware Manual

CHAPTER 4 I/O PORTS
4.1

Overview of I/O Ports

The I/O ports consist of five ports (36 pins) including output-only ports and general-
purpose I/O ports (parallel I/O ports).
The ports also serve as resource pins (I/O pins of peripheral functions).
I/O Port Functions
The functions of the I/O ports are to output data from the CPU to the I/O pins and to fetch
signals input to the I/O pins into the CPU. Input and output are performed via the port data
registers (PDR). Also, for certain ports the direction of each I/O pin can be individually set to
either input or output for each bit by the port data direction register (DDR).
The following lists the function of each port and the peripheral with which the ports also serve
as.
• Port 0: General-purpose I/O port. (Also serve as external interrupt 2 pins in the MB89120A
series only.)
• Port 1: General-purpose I/O port.
• Port 2: Output-only port.
• Port 3: General-purpose I/O port. Also serves as peripherals (serial I/O, external interrupts,
timer, and buzzer pins).
• Port 4: Output-only port.
Table 4.1-1 lists the functions of each port and Table 4.1-2 lists the registers for each port.

Table 4.1-1 Port Function

Port Pin Input
name type
P00 to
P07
(P00/
Port 0
INT20
to P07/
INT27)
2
CMOS*
P10 to
Port 1
P17
P20 to
Port 2 —
P27
P30/
SCK to
P37/BZ
CMOS
(P30/
Port 3 (hystere
SCK to
sis)
P37/
BZ/
RCO)
98
Output Function Bit 7
type
General-
purpose I/O P07
port
—
(External
(INT27)
interrupt 2)
General-
purpose I/O P17
port
CMOS
—
push-
pull
Output-only
P27
port
—
General-
purpose I/O P37
port
BZ
Peripherals (BZ/
RCO)
Bit 6 Bit 5
P06 P05
— — —
(INT26) (INT25)
P16 P15
— — —
P26 P25
— — —
P36 P35
INT2 INT0
Bit 4 Bit 3 Bit 2
P04 P03 P02
— — —
(INT24) (INT23) (INT22)
P14 P13 P12
— — —
P24 P23 P22
— — —
P34 P33 P32
TO/ EC/
SI
1
INT1 SCO*
Bit 1 Bit 0
P01 P00
— —
(INT21) (INT20)
P11 P10
— —
P21 P20
— —
P31 P30
SO SCK