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MC68HC705MC4MP 데이터시트(PDF) 83 Page - Freescale Semiconductor, Inc

부품명 MC68HC705MC4MP
상세설명  General Release Specification
PDF  180 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC705MC4MP 데이터시트(HTML) 83 Page - Freescale Semiconductor, Inc

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16-Bit Timer
Timer
General Release Specification
16-Bit Timer
The timer registers and alternate counter registers can be read at any
time without affecting their values. However, the alternate counter
registers differ from the timer registers in one respect: a read of the timer
register LSB can clear the timer overflow flag (TOF). Therefore, the
alternate counter registers can be read at any time without the possibility
of missing timer overflow interrupts due to clearing of the TOF. See
Figure 9-4.
The free-running counter is initialized to $FFFC during reset and is a
read-only register.
Figure 9-4. State Timing Diagram for Timer Overflow
$FFFF
$0001
$0002
$0000
INTERNAL
TIMER
T00
T01
T10
T11
OVERFLOW
16-BIT
FLAG (TOF)
BUS CLOCK
CLOCKS
COUNTER
NOTE:
The TOF bit is set at timer state T11 (transition of counter from $FFFF to $0000). It is cleared by read-
ing the timer status register (TSR) during the high portion of the internal clock followed by reading the
LSB of the counter register pair (TMRL).
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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