Chapter 14 Enhanced Capture Timer (ECT16B8CV3)
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
535
14.3.2.6
Timer System Control Register 1 (TSCR1)
Read or write: Anytime except PRNT bit is write once
All bits reset to zero.
Table 14-6. TCNT Field Descriptions
Field
Description
15:0
TCNT[15:0]
Timer Counter Bits
— The 16-bit main timer is an up counter. A read to this register will return the current value
of the counter. Access to the counter register will take place in one clock cycle.
Note:
A separate read/write for high byte and low byte in test mode will give a different result than accessing
them as a word. 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.
Module Base + 0x0006
7
6
5
4
3
2
1
0
R
TEN
TSWAI
TSFRZ
TFFCA
PRNT
0
0
0
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 14-9. Timer System Control Register 1 (TSCR1)
Table 14-7. TSCR1 Field Descriptions
Field
Description
7
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.
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.
6
TSWAI
Timer Module Stops While in Wait
0 Allows the timer module to continue running during wait.
1 Disables the timer counter, pulse accumulators and modulus down counter when the MCU is in wait mode.
Timer interrupts cannot be used to get the MCU out of wait.
5
TSFRZ
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.
The pulse accumulators do not stop in freeze mode.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages
