Freescale Semiconductor MC68HC08KH12 - Manual (Page 165)

MC68HC(7)08KH12 — Rev. 1.1 Advance Information
Freescale Semiconductor 165
11.4.1 TIM Counter Prescaler
The TIM clock source can be one of the seven prescaler outputs or the
TIM clock pin, PTE0/TCLK. The prescaler generates seven clock rates
from the internal bus clock. The prescaler select bits, PS[2:0], in the TIM
status and control register (TSC) select the TIM clock source.
11.4.2 Input Capture
With the input capture function, the TIM can capture the time at which an
external event occurs. When an active edge occurs on the pin of an input
capture channel, the TIM latches the contents of the TIM counter into the
TIM channel registers, TCHxH:TCHxL. The polarity of the active edge is
programmable. Input captures can generate TIM CPU interrupt
requests.
11.4.3 Output Compare
With the output compare function, the TIM can generate a periodic pulse
with a programmable polarity, duration, and frequency. When the
counter reaches the value in the registers of an output compare channel,
the TIM can set, clear, or toggle the channel pin. Output compares can
generate TIM CPU interrupt requests.
$001A
TIM Channel 1
Register High
(TCH1H)
Read:
Bit15 Bit14 Bit13 Bit12 Bit11 Bit10 Bit9 Bit8
Write:
Reset: X X X X X X X X
$001B
TIM Channel 1
Register Low
(TCH1L)
Read:
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Write:
Reset: X X X X X X X X
= Unimplemented X = Indeterminate