參數(shù)資料
型號: MC68HC05L16CFU
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: PLASTIC, QFP-80
文件頁數(shù): 140/146頁
文件大?。?/td> 852K
代理商: MC68HC05L16CFU
Prescaler
MC68HC05L16 MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
93
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.
Figure 9-17. Prescaler Block Diagram
Table 9-4. Timebase Prescale Rate Selection
T2R1
T2R0
System Clock
Divided by
00
1
01
4
10
32
11
256
8-BIT DIVIDER
SEL
1111
1432256
T2
R1
T2
R0
CLK2
FOR TIMER 2
CLK1
FOR TIMER 1
1
4
RST
PH2
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