mc68hc908kx8 Freescale Semiconductor, Inc, mc68hc908kx8 Datasheet - Page 166

• Manufacturer Part Number: mc68hc908kx8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Timer Interface Module (TIM)
CHxF — Channel x Flag Bit
CHxIE — Channel x Interrupt Enable Bit
MS0B — Mode Select Bit B
MSxA — Mode Select Bit A
ELSxB and ELSxA — Edge/Level Select Bits
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When channel x is an input capture channel, this read/write bit is set when an active edge occurs on
the channel x pin. When channel x is an output compare channel, CHxF is set when the value in the
TIM counter registers matches the value in the TIM channel x registers.
When TIM CPU interrupt requests are enabled (CHxIE = 1), clear CHxF by reading TIM channel x
status and control register with CHxF set and then writing a 0 to CHxF. If another interrupt request
occurs before the clearing sequence is complete, then writing 0 to CHxF has no effect. Therefore, an
interrupt request cannot be lost due to inadvertent clearing of CHxF.
Reset clears the CHxF bit. Writing a 1 to CHxF has no effect.
This read/write bit enables TIM CPU interrupts on channel x. Reset clears the CHxIE bit.
This read/write bit selects buffered output compare/PWM operation. MS0B exists only in the TIM
channel 0 status and control register.
Setting MS0B disables the channel 1 status and control register and reverts TCH1 to general-purpose
I/O. Reset clears the MSxB bit.
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
Reset clears the MSxA bit.
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 A, and pin PTAx/TCHx is
available as a general-purpose I/O pin.
the ELSxB and ELSxA bits.
1 = Input capture or output compare on channel x
0 = No input capture or output compare on channel x
1 = Channel x CPU interrupt requests
0 = Channel x CPU interrupt requests disabled
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
Before changing a channel function by writing to the MS0B or MSxA bit, set
the TSTOP and TRST bits in the TIM status and control register (TSC).
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
Table
15-3.
Table 15-3
NOTE
shows how ELSxB and ELSxA work. Reset clears
Freescale Semiconductor
Table
15-3.