MULTIFUNCTION TIMER (MFT)
MULTIFUNCTION TIMER (Cont’d)
OUTPUT A CONTROL REGISTER (OACR)
R252 - Read/Write
Table 42. Output A Action Bits
Action on TxOUTA pin when an xx
event occurs
Register Page: 10
xxE0
xxE1
Reset value: 0000 0000
0
0
1
1
0
1
0
1
Set
7
0
Toggle
Reset
NOP
C0E0 C0E1 C1E0 C1E1 OUE0 OUE1 CEV 0P
Bits 7:6 = C0E[0:1]: COMP0 action bits.
Notes:
These bits are set and cleared by software. They
configure the action to be performed on the Tx-
OUTA pin when a successful compare of the
CMP0R register occurs. Refer to Table 42 for the
list of actions that can be configured.
– xx stands for C0, C1 or OU.
– Whenever more than one event occurs simulta-
neously, Action bit 0 will be the result of ANDing
Action bit 0 of all simultaneous events and Action
bit 1 will be the result of ANDing Action bit 1 of all
simultaneous events.
Bits 5:4 = C1E[0:1]: COMP1 action bits.
These bits are set and cleared by software. They
configure the action to be performed on the Tx-
OUTA pin when a successful compare of the
CMP1R register occurs. Refer to Table 42 for the
list of actions that can be configured.
Bit 1 = CEV: On-Chip event on CMP0R.
This bit is set and cleared by software.
0: No action
1: A successful compare on CMP0R activates the
on-chip event signal (a single pulse is generat-
ed)
Bits 3:2 = OUE[0:1]: OVF/UNF action bits.
These bits are set and cleared by software. They
configure the action to be performed on the Tx-
OUTA pin when an Overflow or Underflow of the
U/D counter occurs. Refer to Table 42 for the list of
actions that can be configured.
Bit 0 = OP: TxOUTA preset value.
This bit is set and cleared by software and by hard-
ware. The value of this bit is the preset value of the
TxOUTA pin. Reading this bit returns the current
state of the TxOUTA pin (useful when it is selected
in toggle mode).
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STMICROELECTRONICS [ ST ]
