參數(shù)資料
型號： MC68CK338CPV14B1
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 14.4 MHz, MICROCONTROLLER, PQFP144
封裝： PLASTIC, TQFP-144
文件頁數(shù)： 120/133頁
文件大?。?/td> 944K
代理商： MC68CK338CPV14B1
MC68CK338
MOTOROLA
MC68CK338TS/D
87
CPTR — CPSM Test Register
$YFF40A
CPTR is used during factory testing of the CTM6. Accesses to CPTR must be made while the MCU is
in test mode.
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
Prescaler Division Ratio
PRUN
DIV23
PSEL1 PSEL0 PCLK1 PCLK2 PCLK3 PCLK4 PCLK5 PCLK6
0
X
000000
1000248
16
32
64
1001248
16
32
128
1010248
16
32
256
1011248
16
32
512
110036
12
24
48
96
110136
12
24
48
192
111036
12
24
48
384
111136
12
24
48
768
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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