Port 0 - Fujitsu MB90460 Series Hardware Manual

9.3

Port 0

Port 0 is a general-purpose I/O port. It can also be used for resource I/O. The port pins
can be switched in units of bits between the I/O port and resource. This section
focuses on the general I/O port function. This section also provides the configuration
of port 0, lists of pins, shows a block diagram of the pins, and describes the
corresponding registers.
■ Port 0 Configuration
Port 0 consists of the following:
• General-purpose I/O pins/waveform sequencer output/PWC0 input, output (P00/OPT0 to P07/PWO0)
(waveform sequencer output and PWC0 not present in MB90465 series)
• Port 0 data register (PDR0)
• Port 0 data direction register (DDR0)
• Port 0 pull-up resistor setting register (RDR0)
■ Port 0 Pins
The port 0 I/O pins are also used as resource I/O pins. Therefore, the pins cannot be used as general-
purpose I/O port pins when they are used as resource I/O pins. Table 9.3-1 lists the port 0 pins.
Table 9.3-1 Port 0 Pins
Port Pin
P00/OPT0*
P01/OPT1*
P02/OPT2*
P03/OPT3*
Port 0
P04/OPT4*
P05/OPT5*
P06/PWI0*
P07/PWO0*
*: Pin names not applicable to MB90465 series
See "1.7 I/O Circuit Types", for information on the circuit types.
Port function
(single-chip mode)
P00 OPT0*
P01 OPT1*
P02 OPT2*
General-
P03 OPT3*
purpose I/O
P04 OPT4*
P05 OPT5*
P06 PWI0*
P07 PWO0*
Resource function
Waveform
sequencer output
Waveform
sequencer output
Waveform
sequencer output
Waveform
sequencer output
Waveform
sequencer output
Waveform
sequencer output
PWC0 input
PWC0 output
CHAPTER 9 I/O PORT
I/O form
Circuit
type
Input Output
D
CMOS CMOS
E
167