668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 34
668-0010
Manufacturer Part Number
668-0010
Description
IC MPU RABIT3000 55.5MHZ 128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0010
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Features
-
Other names
316-1016
- Current page: 34 of 312
- Download datasheet (2Mb)
3.1.2 Registers
3.2 Dependencies
3.2.1 I/O Pins
SMODE0, SMODE1 — When the Rabbit 3000 is first powered up or when it is reset, the
state of the SMODE0 and SMODE1 pins controls its operation.
/RESET — Pulling the /RESET pin low will initialize everything in the Rabbit 3000
except for the real-time clock registers.
/CS1 — During reset the impedance of the /CS1 pin is high, and all other memory and I/O
control signals are held high. The special behavior of /CS1 allows an external RAM to be
powered by the same source as the VBATIO pin (which powers /CS1). In this case, a pul-
lup resistor is required on /CS1 to keep the RAM deselected during powerdown.
RESOUT — The RESOUT pin is high during reset and powerdown, but low at all other
times, and can be used to control an external power switch to disconnect VDDIO from
VBATIO when the main power source is removed.
3.2.2 Clocks
The processor requires a 32 kHz clock input to generate the 2400 bps internal clock
required for asynchronous serial bootstrap, which is used when booting via Dynamic C
and the Rabbit Field Utility. No 32 kHz clock is required for either clocked serial or slave
port bootstrap.
When the processor comes out of reset, the CPU clock and peripheral clocks are both in
divide-by-8 mode.
3.2.3 Other Registers
3.2.4 Interrupts
There are no interrupts associated with reset or bootstrap.
24
Slave Port Control Register
SPCR
Register Name
Register
Enable/disable processor monitoring of SMODE
pins; read current state of SMODE pins.
Mnemonic
SPCR
Rabbit 3000 Microprocessor User’s Manual
Function
I/O Address
0x0024
R/W
R/W
0xx00000
Reset
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