FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 175)

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CHAPTER 8 PULSE WIDTH COUNT TIMER (PWC)
Figure 8.6-3 Measuring long pulse width (falling edge to falling edge)
Figure 8.6-4 "Measuring long pulse width (rising edge to rising edge)" shows the operation when the
measured pulse selection bits (PCR2: W1, W0) are set to "10
B
" (rising edge to rising edge).
Figure 8.6-4 Measuring long pulse width (rising edge to rising edge)
Input pulse
(Input waveform to the PWC pin)
EN bit
FF H
Software
counter value
Counter value
UF bit
IR bit
BF bit
Set "0"
One cycle
Cleared by the program
Cleared by the program
Data transferred from down counter
to RLBR RLBR read
0 1 2 3
Input pulse
EN bit
Counter value
IR bit
BF bit
Cleared by the program
0
FF
H
(Input waveform to the PWC pin)
Data transferred from
down counter to RLBR
RLBR read