668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 117

• Manufacturer Part Number: 668-0003-C
• Description: IC CPU RABBIT2000 30MHZ 100PQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 668-0003-C

• Rohs Status: RoHS non-compliant
• Processor Type: Rabbit 2000 8-Bit
• Speed: 30MHz
• Voltage: 2.7V, 3V, 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 100-MQFP, 100-PQFP
• Features: -
• Other names: 316-1004; 668-0003

There are two timers—Timer A and Timer B. Timer A is intended mainly for generating
the baud clock for the serial ports, a periodic clock for clocking parallel ports D and E, or
for generating periodic interrupts. Timer B can be used for the same functions, but it can-
not generate the baud clock. Timer B is more flexible when it can be used because the pro-
gram can read the time from a continuously running counter and events can be
programmed to occur at a specified future time.
Figure 11-1 shows a block diagram of Timers A and B.
Chapter 11 Timers
perclk/2
Timer B System
f/8
Figure 11-1. Block Diagram of Timers A and B
A1
Timer A System
match preload
match preload
10-bit counter
match reg
match reg
10 bits
compare
Timer_B1
11. T
Timer_B2
A5
A4
A6
A7
IMERS
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