s908qy2ad1vdwer Freescale Semiconductor, Inc, s908qy2ad1vdwer Datasheet - Page 136

• Manufacturer Part Number: s908qy2ad1vdwer
• Description: Mc68hc908qt4a Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Timer Interface Module (TIM)
MSxA — Mode Select Bit A
ELSxB and ELSxA — Edge/Level Select Bits
136
MSxB
Setting MS0B causes the contents of TSC1 to be ignored by the TIM and reverts TCH1 to
general-purpose I/O.
When ELSxB:A ≠ 00, this read/write bit selects either input capture operation or unbuffered output
compare/PWM operation. See
When ELSxB:A = 00, this read/write bit selects the initial output level of the TCHx pin (see
Table
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.
X
X
0
0
0
0
0
0
0
1
1
1
1 = Buffered output compare/PWM operation enabled
0 = Buffered output compare/PWM operation disabled
1 = Unbuffered output compare/PWM operation
0 = Input capture operation
1 = Initial output level low
0 = Initial output level high
14-2).
MSxA
X
X
X
0
1
0
0
0
1
1
1
1
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).
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.
ELSxB
0
0
0
1
1
0
0
1
1
0
1
1
Table 14-2. Mode, Edge, and Level Selection
MC68HC908QYA/QTA Family Data Sheet, Rev. 2
ELSxA
Table
0
0
1
0
1
0
1
0
1
1
0
1
14-2.
Output compare
Table 14-2
Buffered output
buffered PWM
Output preset
Input capture
compare or
or PWM
Mode
NOTE
NOTE
shows how ELSxB and ELSxA work.
Pin under port control; initial output level high
Pin under port control; initial output level low
Capture on rising edge only
Capture on falling edge only
Capture on rising or falling edge
Software compare only
Toggle output on compare
Clear output on compare
Set output on compare
Toggle output on compare
Clear output on compare
Set output on compare
Configuration
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