User`s manual

26 RabbitCore RCM2100
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
7 PB6 Output
8 PB7 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 2. RCM2100 Pinout Configurations (continued)
Pin Pin Name Default Use Alternate Use Notes