Datasheet

616
Bits 11 and 10—PA5 Mode 1, 0 (PA5MD1 and PA5MD0): These bits select the function of
the PA5/SCK1/DREQ1/IRQ1 pin.
Bit 11:
PA5MD1
Bit 10:
PA5MD0 Description
0 0 General input/output (PA5) (initial value)
1 Serial clock input/output (SCK1)
1 0 DMA transfer request received input (DREQ1) (PA5 in single
chip mode)
1 Interrupt request input (IRQ1)
Bit 9—Reserved: This bit always reads as 0. The write value should always be 0.
Bit 8—PA4 Mode (PA4MD): Selects the function of the PA4/TxD1 pin.
Bit 8: PA4MD Description
0 General input/output (PA4) (initial value)
1 Transmit data output (TxD1)
Bit 7—Reserved: This bit always reads as 0. The write value should always be 0.
Bit 6—PA3 Mode (PA3MD): Selects the function of the PA3/RxD1 pin.
Bit 6: PA3MD Description
0 General input/output (PA3) (initial value)
1 Receive data input (RxD1)
Bits 5 and 4—PA2 Mode 1, 0 (PA2MD1 and PA2MD0): These bits select the function of the
PA2/SCK0/DREQ0/IRQ0 pin.
Bit 5:
PA2MD1
Bit 4:
PA2MD0 Description
0 0 General input/output (PA2) (initial value)
1 Serial clock input/output (SCK0)
1 0 DMA transfer request received input (DREQ0) (PA2 in single
chip mode)
1 Interrupt request input (IRQ0)
Bit 3—Reserved: This bit always reads as 0. The write value should always be 0.