Rabbit 6000 User’s Manual
digi.com
37
3.2 Dependencies
3.2.1 I/O Pins
SMODE0, SMODE1 — When the Rabbit 6000 is first powered up or when it is reset, the state of the
SMODE0 and SMODE1 pins controls its operation.
SYSCFG — When the Rabbit 6000 is first powered up or when it is reset, the state of this pin controls
whether memory bank zero is mapped to /CS0 or the internal SRAM (/CS3).
/RESET — Pulling the /RESET pin low will initialize everything in the Rabbit 6000 except for the real-
time clock registers, the 32K battery-backed RAM and the onchip-encryption RAM.
/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 pullup resistor is required on /CS1 to keep the RAM
deselected during powerdown.
RESOUT — The RESOUT pin, which is powered by the backup battery, is high during reset and power-
down as long as VBAT and VBATIO are present, 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 asynchro-
nous 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.
Register
Function
SPCR
Enable/disable processor monitoring of SMODE
pins; read current state of SMODE pins.
Summary of Contents for 6000
Page 1: ...Rabbit 6000 Microprocessor User s Manual 90001108_J...
Page 11: ...Rabbit 6000 User s Manual digi com 11 1 3 Block Diagram Figure 1 1 Rabbit 6000 Block Diagram...
Page 43: ...Rabbit 6000 User s Manual digi com 43 4 1 1 Block Diagram...
Page 57: ...Rabbit 6000 User s Manual digi com 57 5 1 1 Block Diagram...
Page 88: ...Rabbit 6000 User s Manual digi com 88 7 2 Block Diagram...
Page 115: ...Rabbit 6000 User s Manual digi com 115 11 1 1 Block Diagram...
Page 127: ...Rabbit 6000 User s Manual digi com 127 12 1 1 Block Diagram...
Page 138: ...Rabbit 6000 User s Manual digi com 138 13 1 1 Block Diagram...
Page 154: ...Rabbit 6000 User s Manual digi com 154 15 1 1 Block Diagram...
Page 163: ...Rabbit 6000 User s Manual digi com 163 16 1 1 Block Diagram...
Page 170: ...Rabbit 6000 User s Manual digi com 170 17 1 1 Block Diagram...
Page 177: ...Rabbit 6000 User s Manual digi com 177 18 1 1 Block Diagram...
Page 186: ...Rabbit 6000 User s Manual digi com 186 19 1 1 Block Diagram...
Page 230: ...Rabbit 6000 User s Manual digi com 230 22 2 Block Diagram...
Page 234: ...Rabbit 6000 User s Manual digi com 234 Figure 22 3 Sample Slow A D Converter Circuit...
Page 287: ...Rabbit 6000 User s Manual digi com 287 25 1 1 Block Diagram...
Page 310: ...Rabbit 6000 User s Manual digi com 310 26 1 1 Block Diagram...
Page 323: ...Rabbit 6000 User s Manual digi com 323 28 1 1 Block Diagram...
Page 351: ...Rabbit 6000 User s Manual digi com 351 31 1 4 Block Diagram...
Page 361: ...Rabbit 6000 User s Manual digi com 361 32 1 1 Block Diagram...
Page 369: ...Rabbit 6000 User s Manual digi com 369 33 2 Block Diagram...
Page 390: ...Rabbit 6000 User s Manual digi com 390 35 1 1 Block Diagram...
Page 408: ...Rabbit 6000 User s Manual digi com 408...
Page 410: ...Rabbit 6000 User s Manual digi com 410...
Page 411: ...Rabbit 6000 User s Manual digi com 411...
Page 420: ...Rabbit 6000 User s Manual digi com 420 Figure 37 1 Memory Read and Write Cycles...