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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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7220 Scheda tecnica(PDF) 263 Page - Renesas Technology Corp |
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7220 Scheda tecnica(HTML) 263 Page - Renesas Technology Corp |
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263 / 303 page  APPENDIX 6.7 Control registers 7220 Group User’s Manual 6-44 Fig. 6.7.21 CRT clock selection register Address 00ED16 b7 b6 b5 b4 b3 b2 b1 b0 CRT clock selection register (CK) [Address 00ED B Name Functions After reset R W CRT Clock Selection Register 0, 1 CRT clock selection bits (CK0,CK1) 0 Since the main clock is used as the clock for display, the oscillation frequency is limited. Because of this, the character size in width (horizontal) direction is also limited. In this case, pins OSC1 and OSC2 are also used as input ports P33 and P34 respectively. The clock for display is supplied by connecting the following across the pins OSC1 and OSC2. • a ceramic resonator only for CRT display and a feedback resistor • a quartz-crystal oscillator only for CRT display and a feedback resistor (Note) 2 to 7 0 0 0 0 0 0 0 b1 The clock for display is supplied by connecting RC or LC across the pins OSC1 and OSC2. Functions 10 b0 CRT oscillation frequency = f(XIN) CRT oscillation frequency = f(XIN)/1.5 Note: It is necessary to connect other ceramic resonator or quartz-crystal oscillator across the pins X 0 0 1 1 1 1 Fix these bits to “0.” IN and XOUT. 16 ] RW RW |
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