101-1226 Rabbit Semiconductor, 101-1226 Datasheet - Page 31

• Manufacturer Part Number: 101-1226
• Description: RCM3900 DEV KIT UNIVERSAL
• Manufacturer: Rabbit Semiconductor
• Series: RabbitCore 3900r
• Type: MPU Moduler

Specifications of 101-1226

• Contents: RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
• For Use With/related Products: RCM3900
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1137

Notes
1. When using pins 33–34 on header J3 to drive LEDs, these pins can handle a sinking
2. The VRAM voltage is temperature-dependent. If the VRAM voltage drops below about
3. Do not overload the /IOWR line because the NAND flash memories have critical
RabbitCore RCM3900 User’s Manual
current of up to 8 mA.
1.2 V to 1.5 V, the contents of the battery-backed SRAM may be lost. If VRAM drops
below 1.0 V, the 32 kHz oscillator could stop running. Pay careful attention to this volt-
age if you draw any current from this pin.
timing requirements. In some cases it may be necessary to buffer /IOWR on the
motherboard.
Pin
20
21
22
23
24
25
26–27
28
29
30
31
32
33
34
PG7
PG6
PG5
PG4
/IOWR
/IORD
SMODE0,
SMODE1
/RESET_IN
VRAM
VBAT_EXT
+3.3 VIN
GND
n.c.
GND
Pin Name
Table 2. RCM3900 Pinout Configurations (continued)
Input/Output
Input/Output
Input/Output
Input/Output
Output
Output
(0,0)—start executing at address zero
(0,1)—cold boot from slave port
(1,0)—cold boot from clocked Serial
Port A
SMODE0 =1, SMODE1 = 1
Cold boot from asynchronous Serial
Port A at 2400 bps (programming cable
connected)
Input
Output
3 V battery Input
Power Input
Default Use
RXE
TXE
RCLKE
TCLKE
Alternate Use
Serial Port E
Serial Clock E ouput
Also connected to programming
cable
Input to Reset Generator
See Notes below table
3.15–3.45 V DC
Reserved for future use
Serial Clock E input
External write strobe
External read strobe
Minimum battery voltage 2.85 V
Notes
31