參數(shù)資料
型號(hào)： MC68HC05L25PB
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, PQFP52
封裝： TQFP-52
文件頁數(shù)： 136/152頁
文件大?。?/td> 897K
代理商： MC68HC05L25PB
Time Base
MC68HC05L25 Data Sheet, Rev. 3.1
84
Freescale Semiconductor
Time base interrupt flag (TBIF) is set every period and an interrupt is requested if the enable bit (TBIE) is
set. The clock divided by 128, 4096, 8192, or 16,384 is used to set TBIF, and this clock is selected by the
TBR1 and TBR0 bits in the TBCR2 register.
9.2.4 COP
The computer operating properly (COP) watchdog timer on the MC68HC05L25 is controlled by the COPE
and COPC bits in the TBCR2 register.
The COP uses the same clock as TBI that is selected by the TBR1 and TBR0 bits. The TBI clock is divided
by four and overflow of this divider generates COP timeout reset if the COP enable (COPE) bit is set. The
COP timeout reset has the same vector address as power-on and external RESET. To prevent the COP
timeout, the COP divider is cleared by writing a one to the COP clear (COPC) bit.
When the time base divider is driven by the OSC clock, the clock for the divider is suspended during stop
mode or when FOSCE is equal to zero. This may cause stretching of the COP period or no COP timeout
reset occurring when there is a processing error. It is recommended that the XOSC clock be used as the
clock source for time base to avoid these problems.
When the COP is enabled during stop mode and the time base is driven by the XOSC clock, the divider
does not stop counting and the COPC bit must be triggered to prevent the COP timeout. It is
recommended that the COP watchdog should be disabled for a system that must have intentional use of
the stop mode period longer than the COP timeout period.
Table 9-2. Time Base Interrupt Frequency
TBCR2
Divide
Ratio
Frequency (Hz)
TBR1 TBR0
OSC = 4.0 MHz
OSC = 4.1943 MHz
XOSC = 32.768 kHz
00
TBCLK
÷ 128
244
256
01
TBCLK
÷ 4096
7.63
8.00
10
TBCLK
÷ 8192
3.81
4.00
11
TBCLK
÷
16,384
1.91
2.00
Table 9-3. COP Timeout Period
TBCR2
COP Period (ms)
TBR1
TBR0
OSC = 4.0 MHz
OSC = 4.1943 MHz
XOSC = 32.768 kHz
Min
Max
Min
Max
Min
Max
0
12.3
16.4
11.7
15.6
11.7
15.6
0
1
393
524
375
500
375
500
1
0
786
1048
750
1000
750
1000
1
1573
2097
1500
2000
1500
2000
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