MC68HC08AS20 Datasheet, PDF (224/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

MSxA — Mode Select Bit A
When ELSxB–ELSxA ≠ 00, this read/write bit selects either input
capture operation or unbuffered output compare/PWM operation.
(See Table 16-3.)
1 = Unbuffered output compare/PWM operation
0 = Input capture operation
When ELSxB–ELSxA = 00, this read/write bit selects the initial output
level of the TCHx pin. (See Table 16-3.) 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 E or port F, and pin PTEx/TCHx or pin PTFx/TCHx is available
as a general-purpose I/O pin. Table 16-3 shows how ELSxB and
ELSxA work. Reset clears the ELSxB and ELSxA bits.
Advance Information
224
MC68HC08AS20 —Rev. 4.1
Freescale Semiconductor