MC68HC12 Datasheet, PDF (251/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit

Enhanced Capture Timer
Timer Register Descriptions
15.4 Timer Register Descriptions
Input/output pins default to general-purpose I/O lines until an internal
function which uses that pin is specifically enabled. The timer overrides
the state of the DDR to force the I/O state of each associated port line
when an output compare using a port line is enabled. In these cases the
data direction bits will have no affect on these lines.
When a pin is assigned to output an on-chip peripheral function, writing
to this PORTT bit does not affect the pin but the data is stored in an
internal latch such that if the pin becomes available for general-purpose
output the driven level will be the last value written to the PORTT bit.
TIOS — Timer Input Capture/Output Compare Select
Bit 7
6
5
4
IOS7
IOS6
IOS5
IOS4
RESET:
0
0
0
0
3
IOS3
0
2
IOS2
0
1
IOS1
0
Bit 0
IOS0
0
$0080
Read or write anytime.
IOS[7:0] — Input Capture or Output Compare Channel Configuration
0 = The corresponding channel acts as an input capture
1 = The corresponding channel acts as an output compare.
CFORC — Timer Compare Force Register
Bit 7
6
5
FOC7
FOC6
FOC5
RESET:
0
0
0
4
FOC4
0
3
FOC3
0
2
FOC2
0
1
FOC1
0
Bit 0
FOC0
0
$0081
Read anytime but will always return $00 (1 state is transient). Write
anytime.
MC68HC912DT128A — Rev 4.0
MOTOROLA
Enhanced Capture Timer
Technical Data
251