Dedicated Inputs; Dedicated Outputs; Memory I/O Interface - Rabbit RabbitCore RCM2200 User Manual

The RCM2200 has 26 parallel I/O lines grouped in five 8-bit ports available on headers J4
and J5. The 16 bidirectional I/O lines are located on pins PA0–PA7, PD3–PD5, and PE0–
PE1, PE4, PE5, and PE7. The pinouts for headers J4 and J5 are shown in Figure 5.
TPOUT-
/IORD

4.1.1 Dedicated Inputs

PB0 is a general CMOS input when the Rabbit 2000 is either not using Serial Port B or is
using Serial Port B in an asynchronous mode. Four other general CMOS input-only pins
are located on PB2–PB5. These pins can also be used for the slave port. PB2 and PB3 are
slave write and slave read strobes, while PB4 and PB5 serve as slave address lines SA0
and SA1, and are used to access the slave registers. PC1 and PC3 are general CMOS inputs
only. These pins can instead be selectively enabled to serve as the serial data inputs for
Serial Ports D and C.

4.1.2 Dedicated Outputs

One of the general CMOS output-only pins is located on PB7. PB7 can also be used with
the slave port as the /SLAVEATTN output. This configuration signifies that the slave is
requesting attention from the master. PC0 and PC2 are also output-only pins; PC0 and
PC2 can instead serve as the serial data outputs for Serial Ports D and C.

4.1.3 Memory I/O Interface

Four of the Rabbit 2000 address lines (A0–A3) and all the data lines (D0–D7) are available.
I/0 write (/IOWR) and I/0 read (/IORD) are also available for interfacing to external devices.
The ports on the Rabbit 2000 microprocessor used in the RCM2200 are configurable, and
so the factory defaults can be reconfigured. Table 1 lists the Rabbit 2000 factory defaults
and the alternate configurations.
20
J4
GND
VCC
PC0
PC1
PC2 PC3
TPOUT+
LNK
PD3
PD4
PD5
/IOWR
PE0
PE1
TPIN-
TPIN+
PE4
PE5
ACT
PE7
A3 A2
A1
A0
Note: These pinouts are as seen on
the Bottom Side of the module.
Figure 5. RCM2200 I/O Pinouts
J5
PA0 PA1
PA2 PA3
PA4 PA5
PA6 PA7
/RES PB0
PB2 PB3
PB4 PB5
PB7 D7
D6 D5
D4 D3
D2 D1
D0 VBAT
VCC GND
RabbitCore RCM2200