User`s manual

10 RabbitCore RCM3000
NOTE: Ports PD0 and PE2 are used for the Ethernet interface.
Locations R38–R43 allow the population of 0 Ω resistors (jumpers) that will be used to
enable future options. These locations are currently unused.
Header J2
20 PG7 Input/Output RXE
21 PG6 Input/Output TXE
22 PG5 Input/Output RCLKE
23 PG4 Input/Output TCLKE
24 /IOWR Output External write strobe
25 /IORD Input External read strobe
26–27
SMODE0,
SMODE1
(0,0)—start executing at address zero
(0,1)—cold boot from slave port
(1,0)—cold boot from clocked Serial Port A
SMODE0 =1, SMODE1 = 1
Cold boot from asynchronous Serial Port A at
2400 bps (programming cable connected)
Also connected to
programming cable
28 /RESET_IN Input Input to Reset Generator
29 VRAM Output
Maximum Current Draw
15 µA
30 VBAT_EXT 3 V battery Input
Minimum battery
voltage 2.8 V
31 +3.3V Input 3.15–3.45 V DC
32 GND
33 n.c.
Future option for +5 V
input or +5 V output
34 GND
Table 1. RCM3000 Pinout Configurations (continued)
Pin Pin Name Default Use Alternate Use RCM3000 Use