参数资料
型号: MC68HC908RK2DW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDSO20
封装: PLASTIC, SOIC-20
文件页数: 38/158页
文件大小: 1020K
代理商: MC68HC908RK2DW
Timer Interface Module (TIM)
MC68HC908RK2 Data Sheet, Rev. 5.1
132
Freescale Semiconductor
MSxB — Mode Select Bit B
This read/write bit selects buffered output compare/PWM operation. MSxB exists only in the TIM
channel 0 and TIM channel 1 status and control registers.
Setting MS0B disables the TIM channel 1 status and control register and reverts TCH1 to
general-purpose I/O.
Reset clears the MSxB bit.
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 11-3.
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 Table 11-3.
Reset clears the MSxA bit.
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 port B, and pin PTBx/TCHx is
available as a general-purpose I/O pin. Table 11-3 shows how ELSxB and ELSxA work. Reset clears
the ELSxB and ELSxA bits.
Table 11-3. 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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