Datasheet

Functional Description
MC68HC908QY/QT Family Data Sheet, Rev. 6
Freescale Semiconductor 121
14.4 Functional Description
Figure 14-2 shows the structure of the TIM. The central component of the TIM is the 16-bit TIM counter
that can operate as a free-running counter or a modulo up-counter. The TIM counter provides the timing
reference for the input capture and output compare functions. The TIM counter modulo registers,
TMODH:TMODL, control the modulo value of the TIM counter. Software can read the TIM counter value
at any time without affecting the counting sequence.
The two TIM channels are programmable independently as input capture or output compare channels.
Figure 14-2. TIM Block Diagram
PRESCALER
PRESCALER SELECT
16-BIT COMPARATOR
PS2 PS1 PS0
16-BIT COMPARATOR
16-BIT LATCH
TCH0H:TCH0L
MS0A
ELS0B ELS0A
TOF
TOIE
16-BIT COMPARATOR
16-BIT LATCH
TCH1H:TCH1L
CHANNEL 0
CHANNEL 1
TMODH:TMODL
TRST
TSTOP
TOV0
CH0IE
CH0F
ELS1B ELS1A
TOV1
CH1IE
CH1MAX
CH1F
CH0MAX
MS0B
16-BIT COUNTER
INTERNAL BUS
MS1A
INTERNAL
BUS CLOCK
TCH1
TCH0
INTERRUPT
LOGIC
PORT
LOGIC
INTERRUPT
LOGIC
INTERRUPT
LOGIC
PORT
LOGIC
PTA2/IRQ/KBI2/TCLK