MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 101

• Manufacturer Part Number: MC68HC705P9CDW
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

9.4 Operation
MC68HC705P9 — Rev. 4.0
MOTOROLA
TCAP
(XTAL
INTERNAL
INTERNAL
DATA BUS
CLOCK
4
2)
SELECT/
DETECT
LOGIC
EDGE
IEDG
The timing reference for the input capture and output compare functions
is a 16-bit free-running counter. The counter is preceded by a divide-by-
four prescaler and rolls over every 2
MHz crystal is 2 s. Software can read the value in the counter at any
time without affecting the counter sequence.
Because of the 16-bit timer architecture, the I/O registers for the input
capture and output compare functions are pairs of 8-bit registers.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 9-1. Timer Block Diagram
OCRH
ICRH
TRH
OCF
TOF
ICF
16-BIT COMPARATOR
16-BIT COUNTER
TIMER OVERFLOW
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OCIE
TOIE
ICIE
OCRL
ICRL
TRL
Timer
18
ATRH
cycles. Timer resolution with a 4-
CONTROL
INTERRUPT
REQUEST
LOGIC
OLVL
TIMER
PIN
TCMP
ATRL
Technical Data
Operation
Timer
101