Port 3 - Fujitsu MB90895 Series Hardware Manual

4.5

Port 3

Port 3 is a general-purpose I/O port that serves as the resource I/O pin. Use port 3 by
switching between the resource pin and the general-purpose I/O port.
The configuration, pin assignment, block diagram of the pins, and registers for port 3
are shown below.
I Configuration of Port 3
Port 3 consists of the following three elements:
• General-purpose I/O port, resource I/O pin (P30 to P33, P35*/X0A, P36*/X1A, P37/AD)
• Port 3 data register (PDR3)
• Port 3 direction register (DDR3)
I Pin Assignment of Port 3
• The pin is used either a resource pin or a general-purpose I/O pin.
• Since the port serves as a resource pin, it cannot be used as a general-purpose I/O port when used as a
resource.
• When using port 4 as the input pin of the resource, set the pin corresponding to the resource in the
DDR4 as an input port.
Table 4.5-1 shows pin assignment of port 3.
Table 4.5-1 Pin Assignment of Port 3
Port Pin
Name Name
P30/
SOT0
P31/
SCK0
P32/
SIN0
port 3
P33
P35/X0A
P36/X1A
P37/
ADTG
*:If the low-speed oscillation pin is selected (for MB90F897), P35 and P36 pins cannot be used.
Reference: For the circuit type, see Section 1.7 I/O Circuit.
Port Function
P30 SOT0
P31 SCK0
P32 SIN0
General-
purpose
I/O
−
P33
−
P35*
−
P36*
P37 ADTG
Resource
UART0 serial clock
CMOS
output
CMOS (hysteresis)/
UART0 serial clock
Automotive
I/O
CMOS
UART0 serial data
CMOS (hysteresis)/
input
Automotive/CMOS
−
−
CMOS
CMOS (hysteresis)/
−
Automotive
External trigger input
for A/D converter
CHAPTER 4 I/O PORT
I/O Type
Input Output
CMOS
CMOS
CMOS
Circu
it
Type
D
H
D
D/A
D/A
D
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