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7721 Datasheet(PDF) 480 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 480 Page - Renesas Technology Corp |
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480 / 577 page  APPENDIX Appendix 3. Control registers 7721 Group User’s Manual 17–17 Up-down register Bit Bit name At reset 0 0 0 0 0 RW Functions b7 b6 b5 b4 b3 b2 b1 b0 Up-down register (Address 4416) 0 0 0 Timer A4 up-down bit Timer A3 up-down bit Timer A2 up-down bit Fix these bits to “0.” Timer A2 two-phase pulse signal processing select bit (Note) Timer A3 two-phase pulse signal processing select bit (Note) Timer A4 two-phase pulse signal processing select bit (Note) 0 : Countdown 1 : Countup This function is valid when the contents of the up-down register is selected as the up- down switching factor. 0 : Two-phase pulse signal processing function disabled 1 : Two-phase pulse signal processing function enabled When not using the two-phase pulse signal processing function, set the bit to “0.” The value is “0” at reading. Note: Use the LDM or STA instruction for writing to bits 5 to 7. 0 1 2 3 4 5 6 7 RW RW RW RW RW WO WO WO 00 |
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