20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 46

• Manufacturer Part Number: 20-668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0011

• 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
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 55.5 MHz
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 55 C
• Number Of Programmable I/os: 56
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 316-1061

36
Bit(s)
Bit(s)
Bit(s)
7:0
7:0
7:0
Secondary Watchdog Timer Register
Watchdog Timer Control Register
Watchdog Timer Test Register
0x005A
0x005F
0x0057
0x0059
0x0053
0x0051
0x0052
0x0053
0x0054
Value
Value
Value
other
other
Restart the watchdog timer with a 2-second timeout period.
Restart the watchdog timer with a 1-second timeout period.
Restart the watchdog timer with a 500 ms timeout period.
Restart the watchdog timer with a 250 ms timeout period.
Restart the secondary watchdog timer (starting with Rabbit 3000A chip).
No effect on watchdog timer or secondary watchdog timer.
Clock the least significant byte of the watchdog timer from the peripheral clock.
(Intended for chip test and code 0x0054 below only.)
Clock the most significant byte of the watchdog timer from the peripheral clock.
(Intended for chip test and code 0x0054 below only.)
Clock both bytes of the watchdog timer, in parallel, from the peripheral clock.
(Intended for chip test and code 0x0054 below only.)
Disable the watchdog timer. This value, by itself, does not disable the watchdog
timer. Only a sequence of two writes, where the first write is 0x0051, 0x0052, or
0x0053, followed by a write of 0x0054, actually disables the watchdog timer.
The watchdog timer will be re-enabled by any other write to this register.
Normal clocking (32 kHz oscillator) for the watchdog timer. This is the condition
after reset.
The time constant for the secondary watchdog timer is stored. This time constant
will take effect the next time that the secondary watchdog counter counts down
to zero. The timer counts modulo n + 1, where n is the programmed time constant.
The secondary watchdog timer can be disabled by writing the sequence 0x005A
– 0x0052 – 0x0044 to this register.
(WDTCR)
(SWDTR)
(WDTTR)
Description
Description
Description
Rabbit 3000 Microprocessor User’s Manual
(Address = 0x000C)
(Address = 0x0008)
(Address = 0x0009)