參數(shù)資料
型號: MC68CK338CPV14
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): 132/133頁
文件大?。?/td> 944K
代理商: MC68CK338CPV14
MOTOROLA
MC68CK338
98
MC68CK338TS/D
The DASM is composed of two timing channels (A and B), an output flip-flop, an input edge detector,
some control logic and an interrupt interface. All control and status bits are contained in the DASMSIC
register.
Channel A consists of one 16-bit data register and one 16-bit comparator. To the user, channel B also
appears to consist of one 16-bit data register and one 16-bit comparator, though internally, channel B
has two data registers (B1 and B2). The operating mode determines which register is accessed by the
software. Refer to Table 59.
Register contents are always transferred automatically at the correct time so that the minimum pulse
(measurement or generation) is just one time base bus count. The A and B data registers are always
read/write registers, accessible via the CTM6 submodule bus.
Eleven DASMs are contained in the CTM6. Figure 23 shows a block diagram of the DASM.
Table 58 DASM Modes of Operation
Mode
Description of Mode
DIS
Disabled — I/O pin is placed in a high impedance state
IPWM
Input pulse width measurement — Capture on leading and the trailing edges of an input pulse
IPM
Input period measurement — Capture on two consecutive rising or falling edges of an input pulse
IC
Input capture — Capture on user-specified edge
OCB
Output compare, flag set on channel B match — Generate leading and trailing edges of an output
pulse and set flag on second edge
OCAB
Output compare, flag set on channels A and B match — Generate leading and trailing edges of an
output pulse and set flag on both edges
OPWM
Output pulse width modulation — Generate continuous PWM output with 7, 9, 11, 12, 13, 14, 15, or
16 bits of resolution
Table 59 Channel B Data Register Access
Mode
Data Register
IPWM, IPM, IC
Registers A and B2 are used to hold the captured values. In these modes,
the B1 register is used as a temporary latch for channel B.
OCA, OCAB
Registers A and B2 are used to define the output pulse. Register B1 is not
used in these modes.
OPWM
Registers A and B1 are used as primary registers and hidden register B2 is
used as a double buffer for channel B.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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