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參數(shù)資料
| 型號： | SAF-C161S-LM3V |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | 16-Bit Single-Chip Microcontroller |
| 中文描述： | 16位單片機 |
| 文件頁數(shù)： | 49/75頁 |
| 文件大?。?/td> | 1315K |
| 代理商： | SAF-C161S-LM3V |
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C161S
Timing Characteristics
Data Sheet
45
V1.0, 2003-11
levels present on the upper half of PORT0 (P0H), i.e. bitfield CLKCFG represents the
logic levels on pins P0.15-13 (P0H.7-5).
Table 13
associates the combinations of these three bits with the respective clock
generation mode.
Prescaler Operation
When prescaler operation is configured (CLKCFG = 001
B
) the CPU clock is derived from
the internal oscillator (input clock signal) by a 2:1 prescaler.
The frequency of
f
CPU
is half the frequency of
f
OSC
and the high and low time of
f
CPU
(i.e.
the duration of an individual TCL) is defined by the period of the input clock
f
OSC
.
The timings listed in the AC Characteristics that refer to TCLs therefore can be
calculated using the period of
f
OSC
for any TCL.
Phase Locked Loop
When PLL operation is configured (via CLKCFG) the on-chip phase locked loop is
enabled and provides the CPU clock (see
Table 13
). The PLL multiplies the input
frequency by the factor
F
which is selected via the combination of pins P0.15-13 (i.e.
f
CPU
=
f
OSC
×
F
). With every
F
’
th transition of
f
OSC
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
f
CPU
is constantly adjusted so
it is locked to
f
OSC
. The slight variation causes a jitter of
f
CPU
which also effects the
duration of individual TCLs.
Table 13
CLKCFG
(P0H.7-5)
1 1 1
1 1 0
1 0 1
1 0 0
0 1 1
0 1 0
0 0 1
0 0 0
C161S Clock Generation Modes
CPU Frequency
f
CPU
=
f
OSC
×
F
f
OSC
×
4
f
OSC
×
3
f
OSC
×
2
f
OSC
×
5
f
OSC
×
1
f
OSC
×
1.5
f
OSC
/ 2
f
OSC
×
2.5
External Clock
Input Range
1)
2.5 to 6.25 MHz
3.33 to 8.33 MHz
5 to 12.5 MHz
2 to 5 MHz
1 to 25 MHz
6.66 to 16.67 MHz
2 to 50 MHz
4 to 10 MHz
1) The external clock input range refers to a CPU clock range of 10
…
25 MHz (PLL operation). If the on-chip
oscillator is used together with a crystal, the oscillator frequency is limited to a range of 4 MHz to 16 MHz.
2) The maximum frequency depends on the duty cycle of the external clock signal.
Notes
Default configuration
–
–
–
Direct drive
2)
–
CPU clock via prescaler
–
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