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M38B57MC Fiches technique(PDF) 23 Page - Mitsubishi Electric Semiconductor |
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M38B57MC Fiches technique(HTML) 23 Page - Mitsubishi Electric Semiconductor |
23 / 69 page MITSUBISHI MICROCOMPUTERS 38B5 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 23 PRELIMINAR Y Notice: This is not a final specification. Some parametric limits are subject to change. Fig. 18 Structure of Timer X Related Registers b7 b0 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 0 0 : f(XIN)/2 or f(XCIN)/4 0 1 : f(XIN)/8 or f(XCIN)/16 1 0 : f(XIN)/64 or f(XCIN)/128 1 1 : Not available Not used (returns "0" when read) Timer X operating mode bits b5 b4 0 0 : Timer mode 0 1 : Pulse output mode 1 0 : Event counter mode 1 1 : 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 Real time port control bit (P85) 0 : Real time port function is invalid 1 : Real time port function is valid Real time port control bit (P86) 0 : Real time port function is invalid 1 : Real time port function is valid P85 data for real time port P86 data for real time port Not used (returns "0" when read) Timer X mode register 2 (TXM2 : address 002F16) b7 b0 Fig. 17 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 P61/CNTR0/CNTR2 CNTR0 “1” “0” “1” “0” “1” “0” Q D Q D P85 P86 “1” “0” XIN XCIN “1” “0” 1/2 1/2 1/8 1/64 P61 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 P61 direction register Pulse width measurement mode Timer X operating mode bit 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 P86 latch P86 direction register P85 latch P85 direction register Latch Latch P85 data for real time port Real time port control bit (P85) P86 data for real time port Real time port control bit (P86) Timer X mode register write signal |
Numéro de pièce similaire - M38B57MC |
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Description similaire - M38B57MC |
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