Rabbit Smartcat - Page 76

70 Smartcat (BL2100)
PB4 Input
I/O Configuration Option
(header JP2)
1 = standard (JP2:1–2)
0 = custom
*
(JP2:2–3)
PB5 Input
Analog Circuit Option
(header JP3)
1 = BL2100/BL2120 (JP3:1–2)
0 = BL2110/BL2130 (JP3:2–3)
PB6 Output Not Used Off
PB7 Output DAC_ADC_SDI Inactive high
PC0 Output TXD RS-485
Serial Port D
Inactive high
PC1 Input RXD RS-485 Inactive high
PC2 Output RTS/TXC RS-232
Serial Port C
Inactive high
PC3 Input CTS/RXC RS-232 Inactive high
PC4 Output TPOUT– (Realtek reset) Initialized by
sock_init
PC5 Input TPOUT+ (Realtek INT0) Pulled up
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 SDO Initialized by sock_init
PD2 Output Not used Inactive high
PD3 Output DAC CLK Line Inactive high
PD4 Output ATXB RS-232
Serial Port B
Inactive high
PD5 Input ARXB RS-232 Inactive high
PD6 Output Not used Inactive high
PD7 Output Not used Inactive high
PE0 Output Digital I/O strobe Inactive high
PE1 Output External I/O enable Inactive high
PE2 N/A Realtek IORB strobe Initialized by
sock_init
PE3 N/A Realtek SDI line Initialized by sock_init
PE4 Input INT0B
Tied to PE5 by 1 k resistor
PE5 Input INT1B
User interrupt input
†
PE6 N/A Realtek IOWB strobe Initialized by sock_init
PE7 Output LCD_KEYPAD strobe Inactive high
* IN16–IN23 are sinking outputs in this custom configuration
† PE5 is driven by PE4 if the interrupt is not being used.
Table A-3. Use of Rabbit 2000 Parallel Ports (continued)
Port I/O Signal Output Function State