Fujitsu F2MC-8L MB89620 Series Hardware Manual page 182

l Count clock selector
Selects a count-down clock for the 8-bit down-counter from the three available internal count
clocks.
8-bit down-counter
l
The 8-bit down-counter starts counting from the value set in the PWC reload buffer register
(RLBR) when operating as an interval timer, and from FF
measurement. When an underflow (01
(PCR2: TO). The TO bit is output to the WTO pin if output to the dedicated pin is specified in the
output pin control bit (PCR1: TOE = "1").
Input pulse edge detector
l
Operates when the pulse width measurement function is selected, and starts or stops the 8-bit
down-counter when an edge input from the PWC pin matches the edge specified by the PWC
pulse width control register 2 (PCR2).
RLBR register
l
When operating in reload timer mode of the interval timer function, the RLBR register value is re-
loaded to the counter and the count continues whenever a counter value underflow (01
occurs.
When performing pulse width measurement, the value of the 8-bit down-counter is transferred to
the RLBR register when measurement completes.
l PCR1 and PCR2 registers
These registers are used to select the function, set operating conditions, enable or disable
operation, control interrupts, and to check the PWC status.
MB89620 series
when performing pulse width
H
→ 00
) occurs, the counter inverts the timer output bit
H H
CHAPTER 8 PULSE WIDTH COUNT TIMER (PWC)
→ 00
)
H H
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