MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 147

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MOTOROLA
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
NOTE:
ELSxB and ELSxA — Edge/Level Select Bits
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.
MSxB
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.
Table 10-3
ELSxB and ELSxA bits.
X
X
0
0
0
0
0
0
1
1
1
MSxA
X
X
X
0
1
0
0
0
1
1
1
Timer Interface Module (TIM)
Table 10-3. Mode, Edge, and Level Selection
shows how ELSxB and ELSxA work. Reset clears the
ELSxB
0
0
0
1
1
0
1
1
0
1
1
ELSxA
0
0
1
0
1
1
0
1
1
0
1
buffered PWM
Output preset
Input capture
compare or
compare
Buffered
or PWM
Output
output
Mode
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
Toggle output on compare
Clear output on compare
Set output on compare
Toggle output on compare
Clear output on compare
Set output on compare
Timer Interface Module (TIM)
Configuration
Input/Output Registers
147