Lifted and amended from http://sourceforge.net/docman/display_doc.php?docid=22647&group_id=88298
To access these ports using bytecode see RegisterAccess
Port 1 is an 8-bit I/O port. Port 1 pins also function as TPU I/O pins (TCLKA, TCLKB, TCLKC, TCLKD, TIOCA0, TIOCB0, TIOCC0, TIOCD0, TIOCA1, TIOCB1, TIOCA2, and TIOCB2) and an address bus output function. Port 1 pin functions change according to the operating mode.
| Name | R/W | Address |
|---|---|---|
| Data direction register | W | 0xFEB0 |
| Data register | R/W | 0xFF60 |
| Read | R | 0xFF50 |
7 - TIOCB2 - Exp Port 54 - CS for serial EEPROM 6 - TIOCA2 - vibrator 5 - TIOCB1 - speaker 4 - TIOCA1 - Exp Port 53 - CS for serial EEPROM 3 - TIOCD0 - NC 2 - TIOCC0 - +3.3v 1 - TIOCB0 - Exp Port 50 0 - TIOCA0 - Exp Port 59
Port 2 is an 8-bit I/O port. Port 2 pins also function as 8-bit timer I/O pins (TMRI0, TMCI0, TMO0, TMRI1, TMCI1, and TMO1). Port 2 pin functions are the same in all operating modes. Port 2 uses Schmitt-triggered input.
| Name | R/W | Address |
|---|---|---|
| Data direction register | W | 0xFEB1 |
| Data register | R/W | 0xFF61 |
| Read | R | 0xFF51 |
7 - TMO1 - Exp Port 55 - serial clock 6 - TMO0 - Reset Atmel uC - Active Low 5 - TMCI1 - NC 4 - TMRI1 - Powerdown RF LMX2315 - Active Low 3 - TMCI0 - Green Led - Active High 2 - TMRI0 - Red Led - Active High 1 - P21 - Exp Port 44 - chip select? 0 - P20 - NC
Port 3 is a 6-bit I/O port. Port 3 pins also function as SCI I/O pins (TxD0, RxD0, SCK0, TxD1, RxD1, and SCK1) and interrupt input pins (IRQ4, IRQ5). Port 3 pin functions are the same in all operating modes. The interrupt input pins (IRQ4, IRQ5) are Schmitt-triggered inputs.
| Name | R/W | Address |
|---|---|---|
| Data direction register | W | 0xFEB2 |
| Data register | R/W | 0xFF62 |
| Read | R | 0xFF52 |
| Open drain control Reg | R | 0xFF76 |
5 - SCK1 - clock Exp Port 4 - SCK0 - CEF - Exp Port 3 - RXD1 - Exp Port: Dout 2 - RXD0 - Receive from Atmel (RF) 1 - TXD1 - Exp Port: Din 0 - TXD0 - Transmit toward Atmel (RF)
Port 4 is an 8-bit input-only port. Port 4 pins also function as A/D converter analog input pins (AN0 to AN3). Port 4 pin functions are the same in all operating modes. Figure 8-4 shows the port 4 pin configuration.
| Name | R/W | Address |
|---|---|---|
| Read | R | 0xFF53 |
3 - AN3 - NC 2 - AN2 - battery level 1 - AN1 - battery level 0 - AN0 - RF Signal Strength
Port 5 is a 4-bit I/O port. Port 5 pins also function as SCI I/O pins (TxD2, RxD2, and SCK2). Port 5 pin functions are the same in all operating modes. Figure 8-5 shows the port 5 pin configuration.
| Name | R/W | Address |
|---|---|---|
| Data direction register | W | 0xFEB4 |
| Data register | R/W | 0xFF64 |
| Read | R | 0xFF54 |
3 - P53 - Charge circuitry enable - Active High 2 - SCK2 - NC 1 - RXD2 - RS232 receive 0 - TXD2 - RS232 transmit
Port A - address lines A19 - A16
Port B - Address lines A15 - A8
Port C - Address lines A7 - A0
Port D - Data lines D15 - D8
Port E - Data lines D7 - D0
Port F is an 8-bit I/O port. Port F pins also function as bus control signal input/output pins (AS, RD, HWR, LWR, WAIT, BREQO, BREQ, and BACK), the system clock (ΓΈ) output pin and interrupt input pins (IRQ0 to IRQ3). The interrupt input pins (IRQ0 to IRQ3) are Schmitt-triggered inputs.
| Name | R/W | Address |
|---|---|---|
| Data direction register | W | 0xFEBE |
| Data register | R/W | 0xFF6E |
| Read | R | 0xFF5E |
7 - F0 - NC 6 - AS# - NC 5 - RD# - read enable - Active Low 4 - HWR# - write enable - Active Low 3 - IRQ3/LWR# - NC 2 - IRQ2 - R_BF - ready line 1 - IRQ1# - SCL - Real Time Clock - clock 0 - IRQ0# - SDA - Real Time Clock - data
Port G is a 5-bit I/O port. Port G pins also function as bus control signal output pins (CS0 to CS3). The A/D converter input pin (ADTRG), and interrupt input pins (IRQ6, IRQ7). The interrupt input pins (IRQ6, IRQ7) are Schmitt-triggered inputs.
| Name | R/W | Address |
|---|---|---|
| Data direction register | W | 0xFEBF |
| Data register | R/W | 0xFF6F |
| Read | R | 0xFF5F |
4 - CS0# - NC 3 - CS1# - Ram Chip Enable 2 - CS2# - Expansion Enable 1 - CS3# - LCD Enable 0 - IRQ6# - NC