MCMC68HC05L16 Freescale Semiconductor, Inc, MCMC68HC05L16 Datasheet - Page 93

• Manufacturer Part Number: MCMC68HC05L16
• Description: M68hc05 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

9.4 Prescaler
The 8-bit prescaler in the timer system divides system clock (PH2) and provides divided clock to each
timer and event input.
CLK1 for timer 1 is a fixed frequency clock (PH2/PH4).
CLK2 for timer 2 is selected by T2R1 and T2R0 bits in the TBCR1, and this clock is also used as the event
input for gate mode. The CLK2 transitions must be synchronous to the falling edge of PH2.
Freescale Semiconductor
RST
PH2
Table 9-4. Timebase Prescale Rate Selection
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
T2R1
Figure 9-17. Prescaler Block Diagram
0
0
1
1
8-BIT DIVIDER
1111
1432256
T2R0
0
1
0
1
System Clock
Divided by
SEL
256
32
1
4
1
4
CLK2
FOR TIMER 2
CLK1
FOR TIMER 1
Prescaler
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