User`s manual

2–4 Hardware Reference RabbitCore RCM2100 Series
Header J2
1 PB0 Input Serial port clock CLKB
2 PB1 Input Serial port clock CLKA
CLKA is connected to
programming port
(header J5, pin 3)
3 PB2 Input Slave port write /SWR
4 PB3 Input Slave port read /SRD
5 PB4 Input SA0
Slave port address lines
6 PB5 Input SA1
7PB6 Output
8PB7 Output
Slave port attention line
/SLAVEATTN
9, 26,
39
GND
10–17 BD[7:0] Input/Output
Buffered Rabbit 2000
data bus
18 PE7
Bitwise or parallel
programmable I/O
I7 output or slave port
chip select /SCS
19 PE6 I6 output Ethernet chip IOWB
20 PE5 I5 output or INT1B input
21 PE4 I4 output or INT0B input
22 PE3 I3 output
23 PE2 I2 output Ethernet chip IORB
24 PE1 I1 output or INT1A input
25 PE0 I0 output or INT0A input
27, 40 VCC
28 VBAT 3 V battery input
29 VRAM 2.1 V output
100 µA maximum current
draw
30 /WDO
Output (Watchdog
output)
May also be used to
output a 30 µs pulse
Outputs a pulse when the
internal watchdog times
out
Table 1: RabbitCore RCM2100 Series Pinout Configurations (continued)
Pin Pin Name Default Use Alternate Use Notes