Chapter 18 Periodic Interrupt Timer (S12PIT24B4CV2)
MC9S12XE-Family Reference Manual , Rev. 1.19
684
Freescale Semiconductor
18.3.0.6
PIT Time-Out Flag Register (PITTF)
Read: Anytime
Write: Anytime (write to clear)
18.3.0.7
PIT Micro Timer Load Register 0 to 1 (PITMTLD0–1)
Read: Anytime
Write: Anytime
Module Base + 0x0005
7
6
5
4
3
2
1
0
R
0
0
0
0
PTF3
PTF2
PTF1
PTF0
W
Reset
0
0
0
0
0
0
0
0
Figure 18-8. PIT Time-Out Flag Register (PITTF)
Table 18-7. PITTF Field Descriptions
Field
Description
3:0
PTF[3:0]
PIT Time-out Flag Bits for Timer Channel 3:0
— 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 18-9. 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 18-10. PIT Micro Timer Load Register 1 (PITMTLD1)
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