20-668-0024 Rabbit Semiconductor, 20-668-0024 Datasheet - Page 48

• Manufacturer Part Number: 20-668-0024
• Description: IC CPU RABBIT4000 128-LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0024

• Processor Type: Rabbit 4000 8-bit
• Speed: 60MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: 20-668-0022; 316-1078

38
Bit(s)
Bit(s)
7:0
7:0
Secondary Watchdog Timer Register
Watchdog Timer Test Register
Value
Value
other
0x51
0x52
0x53
0x54
Clock the least significant byte of the watchdog timer from the peripheral clock.
Clock the most significant byte of the watchdog timer from the peripheral clock.
Clock both bytes of the watchdog timer, in parallel, from the peripheral clock.
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 0x51, 0x52, or
0x53, followed by a write of 0x54, actually disables the watchdog timer. The
watchdog timer will be re-enabled by any other write to this register.
Normal clocking (32 kHz clock) for the watchdog timer.
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 0x5A –
0x52 – 0x44 to this register.
(WDTTR)
(SWDTR)
Description
Description
Rabbit 4000 Microprocessor User’s Manual
(Address = 0x000C)
(Address = 0x0009)