参数资料
型号: 101-1226
厂商: Rabbit Semiconductor
文件页数: 94/168页
文件大小: 0K
描述: RCM3900 DEV KIT UNIVERSAL
标准包装: 1
系列: RabbitCore 3900
类型: MPU 模块
适用于相关产品: RCM3900
所含物品: RabbitCore 模块、开发板、交流适配器、缆线和 Dynamic C? 光盘
其它名称: 316-1137
RabbitCore RCM3900 User’s Manual
31
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.
3. Do not overload the /IOWR line because the NAND flash memories have critical
timing requirements. In some cases it may be necessary to buffer /IOWR on the
motherboard.
Header
J62
20
PG7
Input/Output
RXE
Serial Port E
21
PG6
Input/Output
TXE
22
PG5
Input/Output
RCLKE
Serial Clock E input
23
PG4
Input/Output
TCLKE
Serial Clock E ouput
24
/IOWR
Output
External write strobe
25
/IORD
Output
External read strobe
26–27
SMODE0,
SMODE1
(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)
Also connected to programming
cable
28
/RESET_IN
Input
Input to Reset Generator
29
VRAM
Output
See Notes below table
30
VBAT_EXT
3 V battery Input
Minimum battery voltage 2.85 V
31
+3.3 VIN
Power Input
3.15–3.45 V DC
32
GND
33
n.c.
Reserved for future use
34
GND
Table 2. RCM3900 Pinout Configurations (continued)
Pin
Pin Name
Default Use
Alternate Use
Notes
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