User`s manual

2–2 Hardware Reference RabbitCore RCM2100 Series
The RabbitCore RCM2100 series has 40 parallel
I/O lines grouped in five 8-bit ports available on
headers J1 and J2. The 24 bidirectional I/O lines are
located on pins PA0–PA7, PD0–PD7, and PE0–PE7.
The pinouts for headers J1 and J2 are shown in
Figure 2–2.
The ports on the Rabbit 2000 microprocessor used
in the RabbitCore RCM2100 series are config-
urable, and so the factory defaults can be reconfig-
ured. Table 1 lists the Rabbit 2000 factory defaults
and the alternate configurations.
As shown in Table 1, pins PA0–PA7 can be used to
allow the Rabbit 2000 to be a slave to another pro-
cessor. PE0, PE1, PE4, and PE5 can be used as
external interrupts INT0A, INT1A, INT0B, and
INT1B. Pins PB0 and PB1 can be used to access the
clock on Serial Port B and Serial Port A of the Rab-
bit microprocessor. Pins PD4 and PD6 can be pro-
grammed to be optional serial outputs for Serial
Ports B and A. PD5 and PD7 can be used as alter-
nate serial inputs by Serial Ports B and A.
The Ethernet-enabled versions of the RCM2100 do
not have 0 Ω resistors (jumpers) installed at R21,
R24, and R35–R38, which allows PE6, PE2, and
PD4–PD7 to connect to the RealTek Ethernet chip
that is stuffed on those versions.
Figure 2–2: RabbitCore RCM2100 Series I/O Pinouts
GND
PA7
PA5
PA3
PA1
BA12
BA10
BA8
BA6
BA4
BA2
BA0
PC1
PC3
PC5
PC7-RXA
PD1
PD3
PD5
PD7
VCC
PCLK
PA6
PA4
PA2
PA0
BA11
BA9
BA7
BA5
BA3
BA1
PC0
PC2
PC4
PC6-TXA
PD0
PD2
PD4
PD6
J1
PB0
PB2
PB4
PB6
GND
BD6
BD4
BD2
BD0
PE6
PE4
PE2
PE0
VCC
VRAM
SMODE1
/RESET
STATUS
/BIORD
GND
PB1-CLKA
PB3
PB5
PB7
BD7
BD5
BD3
BD1
PE7
PE5
PE3
PE1
GND
VBAT
/WDO
SMODE0
/RES_IN
/BIOWR
/BBUFEN
VCC
J2
Note:
These pinouts are as seen on
the Bottom Side of the module.