FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 162)

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CHAPTER 8 PULSE WIDTH COUNT TIMER (PWC)
8.3.1 PWC Pulse Width Control Register 1 (PCR1)
The PWC pulse width control register 1 (PCR1) is used to enable or disable functions,
control interrupts and check the state of the pulse width count timer.
■ PWC pulse width control register 1 (PCR1)
Figure 8.3-3 PWC pulse width control register 1 (PCR1)
Address Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Initial value
0014 H EN IE UF IR BF 0-0--000 B
R/W R/W R/W R/W R
BF Bu ffer fu ll fl ag bit
0 No pulse width measurement value.
1 Pulse width measurement value.
IR
Measurement completi on interrupt request flag bi t
Read Wri te
0 Pulse width measurement has not completed. Clears this bit.
1 Pulse width measuremen No effect. The bit does not change.
UF
Underf lo w (01 H 00 H ) in terrupt request flag bit
Read Wri te
0 No underflow (01 H 00 H ) on counter. Clears this bit.
1 Underflow (01 H 00 H ) on counter. No effect. The bit does not change.
The UF, IR, and BF bits are interrupt request flag bits.
IE Interrupt request enable bi t
0 Disables interrupt request output.
1 Enables interrupt request output.
EN
Coun ter operat ion enable b it
Timer function Pulse w idth measure function
0 Count disables/stops. Pulse width measure disables/stops.
1 Count enables/starts. Pulse width measure enables/starts.
R/W : Readable and writable
R : Read-only
— : Unused
: Initial value
t has completed.