User`s manual

User’s Manual 9
Header J2
1–13 A[12:0]
Output Rabbit 2000 address bus
14 STAT
Output (Status) Output
15 PC0
Output TXD
16 PC1
Input RXD
17 PC2
Output TXC
18 PC3
Input RXC
19 PC4
Output TXB
20 PC5
Input RXB
21 PC6
Output TXA
22 PC7
Input RXA
21 PC6
Output TXA
Connected to program-
ming port
22 PC7
Input RXA
23–26 PD[0:3]
Bitwise or parallel
programmable I/O, can
be driven or open-drain
output
16 mA sourcing and
sinking current at full
AC switching speed
27 PD4
ATXB output
28 PD5
ARXB input
29 PD6
ATXA output
30 PD7
ARXA input
31, 40 GND
32, 39 VCC
33 VBATR
3 V battery input
34 VRAM
2.1 V output 100 kΩ minimum load
35–36
SMODE0,
SMODE1
(0,0)—start executing at
address zero
No programming cable
attached
SMODE0 =1, SMODE1 = 1
Cold boot from asyn-
chronous serial port A at
2400 bps (programming
cable connected)
(0,1)—cold boot from
slave port
(1,0)—cold boot from
clocked serial port A
With programming
cable attached
37 /RES_OUT
Reset Output
38 /RES_IN
Reset Input
Table 2. RabbitCore 2000 Pinout Configurations (continued)
Pin Pin Name Default Use Alternate Use Notes