MC9S12KG128 Datasheet, PDF (421/600 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 13 Timer Module (TIM16B8CV1)
Read: Anytime
Write: Has no meaning or effect in the normal mode; only writable in special modes (test_mode = 1).
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.
13.3.2.6 Timer System Control Register 1 (TSCR1)
7
6
5
4
3
2
1
0
R
0
0
0
0
TEN
TSWAI
TSFRZ
TFFCA
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 13-12. Timer System Control Register 1 (TSCR2)
Read: Anytime
Write: Anytime
Table 13-6. TSCR1 Field Descriptions
Field
7
TEN
6
TSWAI
5
TSFRZ
4
TFFCA
Description
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 because the ÷64 is
generated by the timer prescaler.
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 accumulator.
Timer Stops While in Freeze Mode
0 Allows the timer counter to continue running while in freeze mode.
1 Disables the timer counter whenever the MCU is in freeze mode. This is useful for emulation.
TSFRZ does not stop the pulse accumulator.
Timer Fast Flag Clear All
0 Allows the timer flag clearing to function normally.
1 For TFLG1(0x000E), a read from an input capture or a write to the output compare channel (0x0010–0x001F)
causes the corresponding channel flag, CnF, to be cleared. For TFLG2 (0x000F), any access to the TCNT
register (0x0004, 0x0005) clears the TOF flag. Any access to the PACNT registers (0x0022, 0x0023) clears
the PAOVF and PAIF flags in the PAFLG register (0x0021). This has the advantage of eliminating software
overhead in a separate clear sequence. Extra care is required to avoid accidental flag clearing due to
unintended accesses.
MC9S12KG128 Data Sheet, Rev. 1.15
Freescale Semiconductor
421