參數(shù)資料
型號(hào): MC68HC08QT2CDWE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封裝: LEAD FREE, EIAJ, SOIC-8
文件頁數(shù): 36/176頁
文件大?。?/td> 1124K
代理商: MC68HC08QT2CDWE
Timer Interface Module (TIM)
MC68HC08QY/QT Family Data Sheet, Rev. 2
130
Freescale Semiconductor
Setting MS0B causes the contents of TSC1 to be ignored by the TIM and reverts TCH1 to
general-purpose I/O.
1 = Buffered output compare/PWM operation enabled
0 = Buffered output compare/PWM operation disabled
MSxA — Mode Select Bit A
When ELSxB:A
≠ 00, this read/write bit selects either input capture operation or unbuffered output
compare/PWM operation. See Table 14-2.
1 = Unbuffered output compare/PWM operation
0 = Input capture operation
When ELSxB:A = 00, this read/write bit selects the initial output level of the TCHx pin (see
1 = Initial output level low
0 = Initial output level high
NOTE
Before changing a channel function by writing to the MSxB or MSxA bit, set
the TSTOP and TRST bits in the TIM status and control register (TSC).
ELSxB and ELSxA — Edge/Level Select Bits
When channel x is an input capture channel, these read/write bits control the active edge-sensing logic
on channel x.
When channel x is an output compare channel, ELSxB and ELSxA control the channel x output
behavior when an output compare occurs.
When ELSxB and ELSxA are both clear, channel x is not connected to an I/O port, and pin TCHx is
available as a general-purpose I/O pin. Table 14-2 shows how ELSxB and ELSxA work.
NOTE
After initially enabling a TIM channel register for input capture operation
and selecting the edge sensitivity, clear CHxF to ignore any erroneous
edge detection flags.
Table 14-2. Mode, Edge, and Level Selection
MSxB
MSxA
ELSxB
ELSxA
Mode
Configuration
X0
0
Output preset
Pin under port control; initial output level high
X
1
0
Pin under port control; initial output level low
00
0
1
Input capture
Capture on rising edge only
0
1
0
Capture on falling edge only
0
1
Capture on rising or falling edge
01
0
Output compare
or PWM
Software compare only
0
1
0
1
Toggle output on compare
0
1
0
Clear output on compare
0
1
Set output on compare
1X
0
1
Buffered output
compare or
buffered PWM
Toggle output on compare
1
X
1
0
Clear output on compare
1
X
1
Set output on compare
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