SH7018 Datasheet, PDF (303/431 Pages) Renesas Technology Corp – SuperH™ RISC engine

Bit 8—PA4 Mode (PA4MD): Selects the function of the PA4/TXD pin.
Bit 8: PA4MD
0
1
Description
General input/output (PA4)
Transmit data output (TXD)
(Initial value)
Bit 7—Reserved: This bit is always read as 0. The write value should always be 0.
Bit 6—PA3 Mode (PA3MD): Selects the function of the PA3/RXD pin.
Bit 6: PA3MD
0
1
Description
General input/output (PA3)
Receive data input (RXD)
(Initial value)
Bits 5 and 4—PA2 Mode 1 and 0 (PA2MD1, PA2MD0): These bits select the function of the
PA2/IRQ0 pin.
Bit 5: PA2MD1
0
1
Bit 4: PA2MD0
0
1
0
1
Description
General input/output (PA2)
Reserved
Reserved
Interrupt request input (IRQ0)
(Initial value)
Bits 3 to 0—Reserved: These bits are always read as 0. The write value should always be 0.
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