MC3S12RG128 Datasheet, PDF (286/546 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 10 Enhanced Capture Timer (ECT16B8CV1) Block Description
10.3.2.6 Timer System Control Register 1 (TSCR1)
Module Base + 0x0006
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 10-8. Timer System Control Register 1 (TSCR1)
Read or write anytime.
Table 10-3. 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.
Note: If for any reason the timer is not active, there is no ÷64 clock for the pulse accumulator since 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.
Note: TSWAI also affects pulse accumulators and modulus down counters.
Timer and Modulus Counter Stop While in Freeze Mode
0 Allows the timer and modulus counter to continue running while in freeze mode.
1 Disables the timer and modulus counter whenever the MCU is in freeze mode. This is useful for emulation.
Note: 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 PACN3 and PACN2 registers (0x0022,
0x0023) clears the PAOVF and PAIF flags in the PAFLG register (0x0021). Any access to the PACN1 and
PACN0 registers (0x0024, 0x0025) clears the PBOVF flag in the PBFLG register (0x0031). 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.
MC3S12RG128 Data Sheet, Rev. 1.05
286
Freescale Semiconductor