MC68HC11G5 Datasheet, PDF (78/195 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller

Freescale Semiconductor, Inc.
READ: Any time.
WRITE: Has no meaning or effect.
RESET: Indeterminate (not initialized).
These registers are used to latch the value of timer counter 2 when a defined transition is sensed
by the corresponding input capture edge detector. The result obtained by an input capture
corresponds to the value of the counter one cycle after the transition which triggered the edge
detection logic. This delay is required for internal synchronization.
After a read of the most significant byte of the register, counter transfer is inhibited during the next
E-clock cycle. During double byte reads, this inhibited transfer will occur between consecutive read
cycles of the most and least significant bytes.
6.4.4 Output Compare Registers (TOC1 – TOC4)
7
6
5
4
3
2
1
0
$1016 BIT15 BIT14 BIT13 BIT12 BIT11 BIT10 BIT9 BIT8 TOC1
$1017 BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0
$1018 BIT15 BIT14 BIT13 BIT12 BIT11 BIT10 BIT9 BIT8 TOC2
$1019 BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0
$101A BIT15 BIT14 BIT13 BIT12 BIT11 BIT10 BIT9 BIT8 TOC3
$101B BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0
$101C BIT15 BIT14 BIT13 BIT12 BIT11 BIT10 BIT9 BIT8 TOC4
$101D BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0
READ: Any time.
WRITE: Any time.
RESET: $FFFF
A write to a high order byte inhibits the compare for the next E-clock cycle. When the TOCx register
matches the TCNT1 register, the OCxF bit in the TFLG1 register is set and the specified output
action takes place.
All output compare registers have a separate dedicated comparator for comparing against the free
running counter. If a match is found, the corresponding output compare flag bit (OCxF) is set and
a specified action is automatically taken.
For output compare functions OC2, OC3 and OC4, the automatic action is controlled by pairs of bits
in the TCTL1 control register. Each pair of control bits is encoded to specify the output action to be
taken as a result of a successful OCx compare. Output compare functions OC2, OC3 and OC4 are
always associated with Port A bits 6 – 4 respectively.
PROGRAMMABLE TIMER
6-8
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