20-668-0003 Rabbit Semiconductor, 20-668-0003 Datasheet - Page 117

• Manufacturer Part Number: 20-668-0003
• Description: IC CPU RABBIT2000 30MHZ 100PQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0003

• 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
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 30 MHz
• Operating Supply Voltage: 0 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 40
• Number Of Timers: 8 & 10 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 20-668-0003; 316-1062

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
111