User`s manual

User’s Manual 23
Table 1. RabbitCore RCM2300 Pinout Configurations
Pin Pin Name Default Use Alternate Use Notes
Header J4
1GND
2VCC
3 PC0 Output TXD
4 PC1 Input RXD
5 PC2 Output TXC
6 PC3 Input RXC
7 PC6 Output TXA Is also connected to pro-
gramming port used to
program/debug
8 PC7 Input RXA
9 PE2 Bidirectional I/O I/O control
10 PD3
Bitwise or parallel pro-
grammable I/O
11 PD4 ATXB output
12 PD5 ARXB input
13 /IORD Input (I/O read strobe)
14 /IOWR
Output (I/O write
strobe)
15 PE0
Bitwise or parallel pro-
grammable I/O
I0 control or INT0A input
16 PE1 I1 control or INT1A input
17 SMODE1 Startup mode bit input Input
Can only be used as general
inputs after the startup mode
op-code has been read fol-
lowing boot-up
18 SMODE0 Startup mode bit input Input
19 PE4
Bitwise or parallel pro-
grammable I/O
I4 control or INT0B input
20 PE5 I5 control or INT1B input
21 STATUS
Low on first op-code
fetch of instruction
Output
Accessed by addressing
Global Output Control
Register
22 PE7
Bitwise or parallel pro-
grammable I/O
I7 control or slave port
chip select /SCS
23–26 A[3:0] Rabbit 2000 address bus