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M38B72FD Datasheet(PDF) 28 Page - Renesas Technology Corp |
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M38B72FD Datasheet(HTML) 28 Page - Renesas Technology Corp |
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28 / 110 page  38B7 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER MITSUBISHI MICROCOMPUTERS 27 Fig. 20 Structure of timer X related registers Fig. 19 Block diagram of timer X CNTR2 active edge switch bit CNTR2 active edge switch bit Real time port control bit Real time port control bit S “0” “1” “0” “1” “10” “00”,“01”,“11” Q Q T P83/CNTR0/CNTR2 CNTR0 “1” “0” “1” “0” “1” “0” Q D Q D P94 P95 “1” “0” XIN XCIN “1” “0” 1/2 1/2 1/8 1/64 P83 latch Timer X (low-order) (8) Timer X (high-order) (8) Timer X latch (high-order) (8) Timer X latch (low-order) (8) Data bus Pulse output mode P83 direction register Pulse width measurement mode Timer X operating mode bits Timer X stop control bit Pulse output mode Count source selection bit Internal system clock selection bit Timer X write control bit Timer X interrupt request Timer X mode register write signal P95 latch P95 direction register P94 latch P94 direction register Latch Latch P94 data for real time port Real time port control bit (P94) P95 data for real time port Real time port control bit (P95) Timer X mode register write signal b7 b6 b5 b4 b3 b2 b1 b0 Real time port control bit (P94) 0 : Real time port function is invalid 1 : Real time port function is valid Real time port control bit (P95) 0 : Real time port function is invalid 1 : Real time port function is valid P94 data for real time port P95 data for real time port Not used (returns “0” when read) Timer X mode register 1 (TXM1 : address 002E16) Timer X write control bit 0 : Write data to both timer latch and timer 1 : Write data to timer latch only Timer X count source selection bits b2 b1 00 : f(XIN)/2 or f(XCIN)/4 01 : f(XIN)/8 or f(XCIN)/16 10 : f(XIN)/64 or f(XCIN)/128 11 : Not available Not used (returns “0” when read) Timer X operating mode bits b5 b4 00 : Timer mode 01 : Pulse output mode 10 : Event counter mode 11 : Pulse width measurement mode CNTR2 active edge switch bit 0 : • Event counter mode ; counts rising edges • Pulse output mode ; output starts with “H” level • Pulse width measurement mode ; measures “H” periods 1 : • Event counter mode ; counts falling edges • Pulse output mode ; output starts with “L” level • Pulse width measurement mode ; measures “L” periods Timer X stop control bit 0 : Count operating 1 : Count stop Timer X mode register 2 (TXM2 : address 002F16) b7 b6 b5 b4 b3 b2 b1 b0 |
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