Freescale Semiconductor, Inc.
Enhanced Capture Timer
The period of the first count after a write to the TCNT registers may be a
different size because the write is not synchronized with the prescaler
clock.
Bit 7
TEN
0
6
TSWAI
0
5
TSBCK
0
4
TFFCA
0
3
0
2
0
1
0
Bit 0
0
RESET:
TSCR — Timer System Control Register
$0086
Read or write anytime.
TEN — Timer Enable
0 = Disables the main timer, including the counter. Can be used for
reducing power consumption.
1 = Allows the timer to function normally.
If for any reason the timer is not active, there is no ÷64 clock for the
pulse accumulator since the E÷64 is generated by the timer prescaler.
TSWAI — Timer Module Stops While in Wait
0 = Allows the timer module to continue running during wait.
1 = Disables the timer module when the MCU is in the wait mode.
Timer interrupts cannot be used to get the MCU out of wait.
TSWAI also affects pulse accumulators and modulus down counters.
TSBCK — Timer and Modulus Counter Stop While in Background Mode
0 = Allows the timer and modulus counter to continue running while
in background mode.
1 = Disables the timer and modulus counter whenever the MCU is
in background mode. This is useful for emulation.
TBSCK does not stop the pulse accumulator.
TFFCA — Timer Fast Flag Clear All
0 = Allows the timer flag clearing to function normally.
1 = For TFLG1($8E), a read from an input capture or a write to the
output compare channel ($90–$9F) causes the corresponding
channel flag, CnF, to be cleared. For TFLG2 ($8F), any access
Technical Data
MC68HC912DG128 — Rev 3.0
Enhanced Capture Timer
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