User`s manual

136 eDisplay (OP7200)
PC0 Output RTS/TXD RS-232
Serial Port D
Inactive high
PC1 Input CTS/RXD RS-232 Inactive high
PC2 Output TXC RS-232
Serial Port C
Inactive high
PC3 Input RXC RS-232 Inactive high
PC4 Output Realtek Reset Initialized by sock_init
PC5 Input Realtek INT0
Pulled up to Vcc
PC6 Output TXA Programming Port
Serial Port A
Inactive high
PC7 Input RXA Programming Port Inactive high
PD0 Input Realtek CLK Initialized by sock_init
PD1 Input Realtek SD0 Initialized by sock_init
PD2 Output Not Used High
PD3 Output ADC and Touchscreen Chip Select High
PD4 Output ATXB RS-485
Serial Port B
Inactive high
PD5 Input ARXB RS-485 Inactive high
PD6 Output Not Used High
PD7 Output Not Used High
PE0 Output ADC and Touchscreen Serial Clock High
PE1 Output ADC and Touchscreen Data In High
PE2 Output Realtek IORB Strobe Initialized by sock_init
PE3 Output Realtek SDI Line Initialized by sock_init
PE4 Output CPLD Chip Select 0 High
PE5 Output CPLD Chip Select 1 High
PE6 Output Realtek I/O Write Initialized by sock_init
PE7 Output SED1335 Chip Select High
Table A-3. Use of Rabbit 2000 Parallel Ports (continued)
Port I/O Signal Notes