Chapter 17 Periodic Interrupt Timer (S12PIT24B8CV2)
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
667
17.3.0.7
PIT Micro Timer Load Register 0 to 1 (PITMTLD0–1)
Read: Anytime
Write: Anytime
17.3.0.8
PIT Load Register 0 to 7 (PITLD0–7)
Table 17-7. PITTF Field Descriptions
Field
Description
7:0
PTF[7:0]
PIT Time-out Flag Bits for Timer Channel 7:0
— PTF is set when the corresponding 16-bit timer modulus
down-counter and the selected 8-bit micro timer modulus down-counter have counted to zero. The flag can be
cleared by writing a one to the flag bit. Writing a zero has no effect. If flag clearing by writing a one and flag setting
happen in the same bus clock cycle, the flag remains set. The flag bits are cleared if the PIT module is disabled
or if the corresponding timer channel is disabled.
0 Time-out of the corresponding PIT channel has not yet occurred.
1 Time-out of the corresponding PIT channel has occurred.
Module Base + 0x0006
7
6
5
4
3
2
1
0
R
PMTLD7
PMTLD6
PMTLD5
PMTLD4
PMTLD3
PMTLD2
PMTLD1
PMTLD0
W
Reset
0
0
0
0
0
0
0
0
Figure 17-9. PIT Micro Timer Load Register 0 (PITMTLD0)
Module Base + 0x0007
7
6
5
4
3
2
1
0
R
PMTLD7
PMTLD6
PMTLD5
PMTLD4
PMTLD3
PMTLD2
PMTLD1
PMTLD0
W
Reset
0
0
0
0
0
0
0
0
Figure 17-10. PIT Micro Timer Load Register 1 (PITMTLD1)
Table 17-8. PITMTLD0–1 Field Descriptions
Field
Description
7:0
PMTLD[7:0]
PIT Micro Timer Load Bits 7:0
— These bits set the 8-bit modulus down-counter load value of the micro timers.
Writing a new value into the PITMTLD register will not restart the timer. When the micro timer has counted down
to zero, the PMTLD register value will be loaded. The PFLMT bits in the PITCFLMT register can be used to
immediately update the count register with the new value if an immediate load is desired.
Module Base + 0x0008, 0x0009
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
PLD15 PLD14 PLD13 PLD12 PLD11 PLD10 PLD9 PLD8 PLD7 PLD6 PLD5 PLD4 PLD3 PLD2 PLD1 PLD0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 17-11. PIT Load Register 0 (PITLD0)
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
