mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 896

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Functional Description
The following figure shows the FTM counter overflow in up counting. In this case, when
the FTM counter changes from MODH:L to CNTINH:L, the TOF and TOFDIR bits are
set. The TOF bit indicates the FTM counter overflow occurred. TOFDIR indicates the
counting was up when the FTM counter overflow occurred.
The following figure shows the FTM counter overflow in down counting. In this case,
when the FTM counter changes from CNTINH:L to MODH:L, the TOF bit is set and the
TOFDIR bit is cleared. The TOF bit indicates the FTM counter overflow occurred.
TOFDIR indicates the counting was down when the FTM counter overflow occurred.
896
increment/decrement
Figure 37-219. FTM Counter Overflow in Up Counting for Quadrature Decoder Mode
FTM counter
FTM counter
Figure 37-218. Quadrature Decoder – Phase A and Phase B Encoding Mode
CNTINH:L
phase A
phase B
MODH:L
0x0000
increment/decrement
FTM counter
FTM counter
CNTINH:L
1
MODH:L
phase A
phase B
1
0x0000
1
1 1 1 1
MCF51JF128 Reference Manual, Rev. 2, 03/2011
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1
- - - - - -
1 1 1 1 1 1
set TOF
set TOFDIR
Preliminary
-
1
1 1 1 1 1 1 1
set TOF
set TOFDIR
1
- - - - - -
1 1 1 1 1 1
Freescale Semiconductor, Inc.
-
1
1 1 1 1 1 1 1
Time
Time