MC68HC908QC16_07 Datasheet, PDF (202/274 Pages) Freescale Semiconductor, Inc – Microcontrollers

Timer Interface Module (TIM1)
MSxB — Mode Select Bit B
This read/write bit selects buffered output compare/PWM operation. MSxB exists only in the T1SC0
and T1SC2 registers.
Setting MS0B causes the contents of T1SC1 to be ignored by the TIM1 and reverts T1CH1 to
general-purpose I/O.
Setting MS2B causes the contents of T1SC3 to be ignored by the TIM1 and reverts T1CH3 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 16-2.
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 T1CHx pin (see
Table 16-2).
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 TIM1 status and control register (T1SC).
Table 16-2. Mode, Edge, and Level Selection
MSxB
X
X
0
0
0
0
0
0
0
1
1
1
MSxA
0
1
0
0
0
1
1
1
1
X
X
X
ELSxB
0
0
0
1
1
0
0
1
1
0
1
1
ELSxA
0
0
1
0
1
0
1
0
1
1
0
1
Mode
Output preset
Input capture
Output compare
or PWM
Buffered output
compare or
buffered PWM
Configuration
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
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.
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 3
202
Freescale Semiconductor