DS07-16303-3E Datasheet, PDF (34/97 Pages) Fujitsu Component Limited. – 32-bit RISC Microcontroller CMOS FR30 Series

MB91121
s PERIPHERAL RESOURCES
1. I/O Ports
There are 2 types of I/O port register structure; port data register (PDR2, 6, 8, A, B, E to I) and data direction
register (DDR2, 6, 8, A, B, E to I) , where bits PDR2, 6, 8, A, B, E to I and bits DDR2, 6, 8, A, B, E to I corresponds
respectively. Each bit on the register corresponds to an external pin. In port registers input/output register of
the port configures input/output function of the port, while corresponding bit (pin) configures input/output function
in data direction registers. Bit “0” specifies input and “1” specifies output.
• For input (DDR = “0”) setting;
PDR reading operation : reads level of corresponding external pin.
PDR writing operation : writes set value to PDR.
• For output (DDR = “1”) setting;
PDR reading operation : reads PDR value.
PDR writing operation : outputs PDR value to corresponding external pin.
• Block diagram
Resource input
0
1
PDR read
0
Pin
PDR
(Port data register)
Resource output 1
DDR
(Data direction register)
Resource output enable
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