Table 2. RCM3360/RCM3370 Pinout Configurations (continued)
Pin
20
Pin Name
PG7
Default Use
Input/Output
Alternate Use
RXE
Notes
Serial Port E
21
PG6
Input/Output
TXE
22
23
24
25
PG5
PG4
/IOWR
/IORD
Input/Output
Input/Output
Output
Input
RCLKE
TCLKE
Serial Clock E input
Serial Clock E ouput
External write strobe
External read strobe
(0,0)—start executing at address zero
(0,1)—cold boot from slave port
26–27
SMODE0,
SMODE1
(1,0)—cold boot from clocked Serial Port A
Also connected to
programming cable
SMODE0 =1, SMODE1 = 1
Cold boot from asynchronous Serial Port A at
2400 bps (programming cable connected)
28
29
30
31
32
33
34
/RESET_IN
VRAM
VBAT_EXT
+3.3 VIN
GND
n.c.
GND
Input
Output
3 V battery Input
Power Input
Input to Reset Generator
See Notes below table
Minimum battery
voltage 2.85 V
3.15–3.45 V DC
Reserved for future use
Notes
1. When using pins 33–34 on header J3 to drive LEDs, these pins can handle a sinking
current of up to 8 mA.
2. The VRAM voltage is temperature-dependent. If the VRAM voltage drops below about
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.
26
RabbitCore RCM3360/RCM3370
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