參數(shù)資料
型號: CTMRM
英文描述: Configurable Timer Module Reference Manual
中文描述: 配置定時器模塊參考手冊
文件頁數(shù): 54/164頁
文件大小: 1148K
代理商: CTMRM
MOTOROLA
6-4
CTM
REFERENCE
MODULUS COUNTER SUBMODULE (MCSM)
For More Information On This Product,
Go to: www.freescale.com
6
6.5
The MCSM time base bus driver
The DRVA and DRVB bits in the MCSMSIC register select the time base buses to be driven (see
Section 6.8.1). Which of the time base buses is driven depends on where the MCSM is physically
placed in any particular CTM implementation. See Section 1.4 for information on the structure of
the time base buses. For examples of MCSM waveforms and timings, please refer to Section 10.1.
Warning:
It is not recommended that the two time base buses be driven at the same time.
6.6
MCSM interrupts
A valid MCSM interrupt can be generated when the COF bit in the MCSMSIC register is set as a
result of the counter overflowing. If the interrupt priority level of the MCSM is non-zero, as defined
by the three IL bits in the MCSMSIC register, a valid interrupt request will occur on the IMB.
6.7
Freeze action on the MCSM
When the IMB FREEZE signal is recognized, the MCSM counter stops counting and remains set
at its last value. When the FREEZE signal is negated, the counter starts incrementing from its last
value, as if nothing had happened. All registers are accessible during freeze.
During freeze, the IN1 and IN2 bits in the MCSMSIC continue to reflect the states of the signals
on the input pins (see Section 6.8.1).
6.8
MCSM registers
The MCSM register map comprises four 16-bit register locations. As shown in Table 6-1, the
register block contains three FCSM registers and one reserved register. All unused bits and
reserved address locations return zero when read by the software. Writing to unused bits and
reserved address locations has no effect. In CTM implementations featuring multiple MCSMs,
each MCSM has its own set of registers.
Note:
All register addresses in this section are specified as offsets from the base address of
the MCSM.
F
.
Freescale Semiconductor, Inc.
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