IXXBB1 Fujitsu Microelectronics, Inc., IXXBB1 Datasheet - Page 60

• Manufacturer Part Number: IXXBB1
• Description: 32-bit Proprietary Microcontroller Cmos Fr60 Mb91301 Series
• Manufacturer: Fujitsu Microelectronics, Inc.

60
MB91301 Series
2. I/O Ports
Note : For port output, the pull-up resistor is disabled irrespective of the setting.
I/O port (with pull-up resistor) block diagram
MB91301 series pins can be used as I/O ports when not set for use by the external bus interface or the various
peripheral I/O functions.
I/O ports with pull-up resistors have the following registers :
I/O ports have three following modes
• When port is in input mode (PFR
• When port is in output mode (PFR
• When port is in peripheral output mode (PFR
PDR (Port Data Register)
DDR (Data Direction Register)
PFR (Port Function Register)
PCR (Pull-up Control Register)
Port Bus
PDR read : Reads the level of the corresponding external pin.
PDR write : Writes the value to the PDR.
PDR read : Reads the PDR value.
PDR write : Outputs the PDR value to the corresponding external pin.
PDR
PDR write : Writes the value to the PDR.
Peripheral output
: Reads the value of the corresponding peripheral output.
DDR
PDR
PFR
PCR
PDR read
PCR
PCR
0 : No pull-up resistor
1 : Use pull-up resistor
“0” & DDR
“0” & DDR
1
0
“1” & DDR
“0”)
“1”)
Peripheral input
“X”)
0
1
PDR
DDR
PFR
PCR
: Port Data Register
: Data Direction Register
: Port Function Register
: Pull-up Control Register
Pull-up resistor
(approx. 25 k )
Pin