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參數(shù)資料
| 型號(hào)： | SAK-C164CH-8FM |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 0.65 MM PITCH, METRIC, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 46/74頁 |
| 文件大?。?/td> | 917K |
| 代理商： | SAK-C164CH-8FM |
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&
Data Sheet
48
1999-08
Prescaler Operation
When pins P0.15-13 (P0H.7-5) equal 001
B during reset the CPU clock is derived from
the internal oscillator (input clock signal) by a 2:1 prescaler.
The frequency of
I
CPU is half the frequency of IOSC and the high and low time of ICPU
the duration of an individual TCL) is defined by the period of the input clock
I
OSC.
The timings listed in the AC Characteristics that refer to TCLs therefore can be
calculated using the period of
I
OSC for any TCL.
Phase Locked Loop
For all combinations of pins P0.15-13 (P0H.7-5) except for 001
B and 011B the on-chip
phase locked loop is enabled and provides the CPU clock (see table above). The PLL
multiplies the input frequency by the factor F which is selected via the combination of
pins P0.15-13 (i.e.
I
CPU = IOSC * F). With every F’th transition of IOSC the PLL circuit
synchronizes the CPU clock to the input clock. This synchronization is done smoothly,
i.e. the CPU clock frequency does not change abruptly.
Due to this adaptation to the input clock the frequency of
I
CPU is constantly adjusted so
it is locked to
I
OSC. The slight variation causes a jitter of ICPU which also effects the
duration of individual TCLs.
Table 10
C164 Clock Generation Modes
P0.15-13
(P0H.7-5)
CPU Frequency
I
CPU = IOSC * F
External Clock
Input Range
1)
Notes
11 1
I
OSC * 4
2.5 to 6.25 MHz
Default configuration
110
I
OSC * 3
3.33 to 8.33 MHz
101
I
OSC * 2
5 to 12.5 MHz
100
I
OSC * 5
2 to 5 MHz
011
I
OSC * 1
1 to 25 MHz
Direct drive
2)
010
I
OSC * 1.5
6.66 to 16.6 MHz
001
I
OSC / 2
2 to 50 MHz
CPU clock via prescaler
000
I
OSC * 2.5
4 to 10 MHz
1) The external clock input range refers to a CPU clock range of 10...25 MHz.
2) The maximum frequency depends on the duty cycle of the external clock signal.
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