參數(shù)資料
型號： MC68CK338
廠商： Motorola, Inc.
元件分類： 32位微控制器
英文描述： Highly Integrated, Low-Power, 32-Bit Microcontroller
中文描述： 高度集成，低功耗，32位微控制器
文件頁數(shù)： 87/133頁
文件大小： 798K
代理商： MC68CK338
MC68CK338
MC68CK338TS/D
MOTOROLA
87
CPTR —
CPSM Test Register
CPTR is used during factory testing of the CTM6. Accesses to CPTR must be made while the MCU is
in test mode.
$YFF40A
6.6 Clock Sources for Counter Submodules
One of seven clock sources can be chosen for each counter submodule. Five of them are fixed
prescaler taps derived from the system clock:
÷
2,
÷
4,
÷
8,
÷
16, and
÷
32. A sixth prescaler tap is software
selectable as the system clock divided by 64, 128, 256, or 512. An alternate prescaler option provides
fixed prescaler taps of the system clock divided by 3, 6, 12, 24, and 48. In this case, the software se-
lectable tap is the system clock divided by 96, 192, 384, or 768.
The seventh selectable clock source is an external pin which may trigger on the rising or falling edge of
the input signal. The external input allows a clock frequency to be selected that is not based on the MCU
system clock. Alternately, the external clock input allows a counter submodule to be used for pulse or
event counting.
NOTE
The external clock inputs for MCSM30 and MCSM31 are tied to the I/O pin CTD5
for DASM5. The external clock inputs for MCSM2 and FCSM3 are tied to the I/O
pin CTD27 for DASM27.
6.7 Free-Running Counter Submodule (FCSM)
The free-running counter submodule (FCSM) has a 16-bit up counter with an associated clock source
selector, selectable time-base bus drivers, software writable control registers, software readable status
bits, and interrupt logic. When the 16-bit up counter overflows from $FFFF to $0000, an optional over-
flow interrupt may be generated.
Software selects which, if any, time-base bus is to be driven by the 16-bit counter. A software control
register selects whether the clock input to the counter is one of the taps from the prescaler or an input
pin. The polarity of the external input pin is also programmable.
One FCSM is contained in the CTM6.
Figure 20
shows a block diagram of the FCSM.
Table 49 Prescaler Division Ratio Select Field
Prescaler Control Register Bits
PRUN
DIV23
0
X
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
Prescaler Division Ratio
PSEL1 PSEL0 PCLK1 PCLK2 PCLK3 PCLK4 PCLK5 PCLK6
X
X
0
0
0
0
2
4
0
1
2
4
1
0
2
4
1
1
2
4
0
0
3
6
0
1
3
6
1
0
3
6
1
1
3
6
0
8
8
8
8
12
12
12
12
0
0
0
16
16
16
16
24
24
24
24
32
32
32
32
48
48
48
48
64
128
256
512
96
192
384
768
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68CK338CPV14 制造商:Rochester Electronics LLC 功能描述:- Bulk
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MC68CM16Z1 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC16Z Series
MC68CM16Z1CFC16 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC16Z Series
MC68CM16Z1CPV16 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC16Z Series
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